There seems to be some impetus, among collectors of stamps featuring flora and fauna, to catalogue according to species. And here's the thing I'm learning about species names: their English translations aren't particularly consistent. What I've here called the Senegal Frog (Kassina senegalensis), for example, has many aliases: The Senegal Land Frog, the Running Frog, Senegal Running Frog, and the Bubbling Kassina--not to be confused with the Burbling Kassina, which it is also called. It's sometimes hard to choose. I mean, "Crowned Bullfrog" is probably more descriptive of the Euphlyctis occipitalis, but "Giant Swamp Frog" is just so much more evocative. Occasionally, I've entered some species under two English names, particularly if both seem to be in wide use.
If you're really interested in species, Nils Boysen has done a great job of this on his Web site, Reptiles on Stamps (he has maps and has catologued species in by order/genus, etc.). This site, in addition to the Frogs and Toads checklist from the American Topical Associaton and the Scott catalogues, are the major sources for my list.
Species A-H
African Bullfrog (Pxyicephalus adspersus)
Swaziland
Tanzania
African Clawed Frog (Xenopus laevis)
Tanzania
African Toad (Bufo regularis)
Ivory Coast
Mozambique
Agile Frog (Rana dalmatina)
Bosnia/Serbia
Jersey
Amami Oshima Frog (Odorrana spendida)
Japan
American Bullfrog (Lithobates catesbeianus)
North Korea
USA
American Green Tree Frog (Dryophytes cinereus)
United States
Annam Flying Frog (Rhacophorus annamensis)
Vietnam
Armored Mist Frog (Litoria lorica)
Australia
Aquatic River Frog (Rana vertebralis)
Lesotho
Asian Brown Tree Frog/Golden Tree Frog (Polypedates leucomystax)
Malaysia
Angola River Frog (Rana angolensis)
Mozambique
Angolan Reed Frog (hyperolius parallelus)
Namibia
Asiatic Toad (Bufo gargarizans)
North Korea
Australian Lace-lid (Litoria dayi)
Australia
Azuay Stubfoot Toad (Atelopus bomolochos)
Ecuador
Babbling Kassina (kassina senegalensis)
Namibia
Bahamian Greenhouse Frog (Eleutherodactylus planirostris)
Bahamas
Barrett's Glass Frog (Nymphargus pluvialis)
Bolivia
Banded Rubber Frog (Phrynomantis bifasciatus)
South Africa
Banded Stream Frog (Strongylopus bonaespei)
South Africa
Baw Baw Frog (Philoria frosti)
Australia
Berber Toad (Bufo mauritanicus)
Guinea
Bleeding Toad (Leptophryne cruentata)
Indonesia
Blessed Poison Frog (Ranitomega benedicta)
` Aruba
Black Narrow-Mouthed Frog (Nelsonophryne aterrima)
Panama
Black Spotted Frog (Rana nigormaculatus)
Lesotho
North Korea
Black-Spotted Sticky Frog (Kalophrynus pleurostigma)
Singapore
Black-webbed Treefrog (Rhacophorus kio)
Thailand
Vietnam
Blue Mountain Tree Frog (Litoria citropa)
Australia
Blue Poison Frog (Dentrobates azureus)
Netherlands Antilles
Boetteger's Dainty Frog (Cacosternum boettgeri)
Botswana
Brown-Backed Tree Frog (Leptopelis sp.)
Venda
Bubbling Kassina (Kassina sensgalensis)
Lesotho
South Africa
Burmeister's Leaf Frog (Phyllomedusa burmeisteri)
Suriname
Bushveld Rain Frog (Breviceps adspersus)
Swaziland
Canadian Toad (Bufo hemiophyrs)
Guinea
Cane Toad--see Marine Toad
Caucasian Parsley Frog (Pelodytes caucasicus)
Georgia
Chilean Helmeted Bullfrog (Rana chilena)
Chile
Chinese Brown Frog (Rana chensinensis)
Mongolia
Clown Treefrog (Hyla leucophyllata)
Angola
Common Big-Eyed Tree Frog (Nyctimystes narinosa)
Papua New Guinea
Common Forest Frog (Platymantis dorsalis)
Philippines
Common Frog (Rana temporaria)
Angola
Belarus
Guernsey
Isle of Man
Romania
Spain
Common Green Frog (Hylarana erythraea)
Thailand
Copper-cheeked Frog (Hylarana chalconota)
Singapore
Couch's Spadefoot Toad (Scaphiopus couchii)
Nevis
Crucifix Toad (Notaden bennetti)
Australia
Cuban Tree Frog (Osteophilus septentrionalis)
Cuba
Dwarf Grass Frog ( Ptychadena taenioscelis)
South Africa
Dybowski's Frog (Rana dybowskii)
Russia
Dyeing Dart Frog (Dendrobates tinctorius)
Great Britain
Netherlands Antilles
Samoa
Suriname
United Nations, New York City
Vietnam
Eastern Spadefoot Toad/Syrian Spadefoot Toad (Pelobates syracus)
Israel
Yugoslavia
Edible Frog (Rana esculenta)
France
Vietnam
Yugoslavia
Poland
Efogi Tree Frog (Litoria prora)
Papua New Guinea
Elegant Long-Fingered Frog (Cardioglossa elegans)
Cameroun
Emerald Tree Frog (Rhacophorus smaragdinus)
Taiwan
Equatorial Guinea Long-Fingered Frog (Cardioglossa escalerae)
Cameroun
European Common Brown Frog (Rana temporaria)
Cuba
European Common Toad (Bufo bufo laur)
Tanzania
European Green Frog (Rana esculenta)
Czechoslovakia
European Green Toad (Bufo viridis)
Germany (DDR)
Northern Cyprus
Poland
Sweden
European Tree Frog (Hyla arborea)
Albania
Belarus
Belgium
Hungary
Luxembourg
Moldova
Poland
Romania
Serbia
Spain
Sweden
Switzerland
Turkey
Fenoulhet's Toad (Bufo fenoulheti)
Botswana
Fiji Ground Frog
Fire Toad--see Bleeding Toad
Fire-Bellied Toad (Bombina bombina)
Belarus
Czechoslovakia
Poland
Slovenia
Turkey
Five-striped Reed Frog (Hyperolius quinquevittatus)
Guinea
Flying Frog (Rhacophorus nigropalmatus)
Cambodia
Fornasini's Spiny Reed Frog (Afrixalus fornasini)
Mozambique
Gardiner's Frog (Sooglossus gardineri)
Seychelles
Giant African Bullfrog (Pyxicephalus adspersus)
Botswana
Giant Ditch Frog--see Mountain Chicken
Giant Fiji Ground Frog (Platymantis megabotoniviti) (extinct)
Fiji
Giant Philippine Frog (Rana magna)
Philippines
Gliding Leaf Frog (Agalycinis spurrelli)
Ecuador
Gliding Tree Frog (Rhacophorus pardalis)
Philippines
Golden Frog (Rana plancyi chosenica)
South Korea
Golden Poison Dart Frog (Rana venenosa)
Nicaragua
Golden Poison Frog (Phyllobates terribilis)
Colombia
Romania
Golden Mantella (Mantella aurantiaca)
United Nations, New York City
Vietnam
Golden Tree Frog (Hyla aurea)
Vietnam
Golfodulcean Poison Frog (Phyllobates vittatus)
United Nations, Geneva
Goliath Frog (Rana goliaph)
Tanzania
Grecian Frog (Rana graeca)
Yugoslavia
Green and Black Poison Frog (Dendrobates auratus
MIcronesia
Green Burrowing Frog (Scaphiophryne marmorata)
UN--Vienna
Green-eyed Frog (Lithobates vibicarius)
Costa Rica
Green Frog (Lithobates climatans)
St. Pierre and Miquelon
Green Paddy Frog (Rana erythraea)
Malaysia
Green Treefrog (Hyla cinerea)
Netherlands Antilles
Greenhouse Frog (Eleutherodactylus planirostris)
Bahamas
Greshoff's Tree Frog (Cryptothylax greshoffi)
Rio Muni
Grey Foam-Nest Tree Frog (Chiromantis xerampelina)
Venda
Guatemala Spikethumb Frog (Plectrohyla guatemalensis)
El Salvador
Guppy's Frog (Discodeles guppyi)
Solomon Islands
Guttural Toad (Bufo gutturalis)
Lesotho
Hallowell's Tree Frog (Hyla halowelli)
Vietnam
Hamilton's Frog (Leiopelma hamiltoni)
Maldives
New Zealand
Hispaniolan Giant Tree Frog (Hyla vastus)
Haiti
Horned Land Frog (Sphenophryne cornuta)
Papua New Guinea
Hose's Tree Toad (Pedostibes hosii)
Malaysia
Hourglass Tree Frog (Hyla ebraccata)
Costa Rica
Hula Painted Frog (Discoglossus nigriventer)
Israel
Israel (souvenir sheet margin)
Javelin Frog (Litoria microbelos)
Australia
Sepcies I-P
Imbabura Tree Frog (Hyla picturata)
Ecuador
Italian Agile Frog (Rana latastei)
Slovenia
Johnstone's Whistling Frog (Eleutherodactylus johnstonei)
Bermuda
Montserrat
Kassam Tree Frog (Litoria multiplica)
Papua New Guinea
Korean Toad (Bufo bufo gargarizans)
South Korea
La Loma Treefrog (Hyla colymba)
Panama
Leaf-nesting Frog (Phyllomedusa trinitarus)
Venezuela
Lemur Leaf Frog (Agalychnis lemur)
Samoa
Long Reed Frog (hyperolius nasutus)
Namibia
Long-legged Wood Frog) (Rana macrocnemis)
Russia
Long-Nosed Horned Frog (Megophrys nasuta)
Malaysia
Thailand
Long-toed Tree Frog (Leptopelis xenodactylus)
South Africa
Lovely Poison Frog (Phyllobates lugubris)
Costa Rica
Lutz's poison frog (Ameerega flavopicta); (Boana buriti)
Brazil
Manchurian Narrowmouth Toad (Kaloula borealis)
Magnificent Tree Frog (Pelodryas splendida)
Australia
Malagasy Painted Mantella (Mantella madagascariensis)
UN--Geneva
UN--Vienna
Mallorcan Midwife Toad (Ayles muletensis)
Jersey
South Koran
Manaus slender-legged tree frog (Osteocephalus taurinus)
Brazil
Marbled Reed Frog (Hyperolius marmoratus)
Zambia
Marine Toad (Bufo marinus)
Grenada
Grenada Grenadines
Montserrat
St. Vincent
Solomon Islands
Marsh Frog (Rana ridibunda)
Yugoslavia
Mediterranean Painted Frog (Discoglossus pictus)
Malta
Mediterranean Tree Frog/Stripeless Tree Frog (Hyla meridionalis)
Monaco
Mexican Tree Frog/Baudin's Tree Frog (Smilisca baudinii)
El Salvador
Michael Rainforest Frog (Cophixalus nubicola)
Papua New Guinea
Moor Frog (Rana arvalis)
Aland
Morelet's Tree Frog (Agalychnis moreletii)
El Salvador
Mottled Shovelnosed Frog (Hemisus marmoratus)
Tanzania
Mongolian Toad (Bufo raddei)
Mongolia
Monte Iberia Eleuth (Eleutherodactylus iberia)
Cuba
Mountain Chicken (Leptodactylus fallax)
Dominica
Montserrat
Namaqua Rain Frog (Breviceps manaquensis)
South Africa
Natal Leaf-folding frog (Afrixalus spinifrons)
South Africa
Natterjack Toad (Bufo calamita)
Denmark
Great Britain
Ireland
Lithuania
Poland
North American Bullfrog (Rana catesbiana)
Dominica
Northern Cricket Frog (Acris crepitans)
Canada
Northern Dwarf Tree Frog (Litoria bicolor)
Australia
Northern Leopard Frog (Lithobates pipens)
United States
Nuosong Long-Fingered Frog (Cardioglossia trifasciata)
Cameroun
Olive Midwife Toad (Alytes obstericians)
Spain
Olive Toad (Amietophrynus garmani)
Swaziland
Orange-legged leaf frog (Pithecopus oreades, Pithecopus hypochondriatus)
Brazil
Orange-thighed Tree Frog (Litoria xanthomera)
Australia
Oriental Fire-Bellied Toad (Bombina orientalis)
North Korea
Ornamented Pygmy Frog (Microhyla ornata)
China--Macau
Ornate Chorus Frog (Pseudacris ornata)
USA
Oronico Lime Tree Frog (Sphaenorhynchus lacteus)
Ecuador
Otton Frog (Babina subaspera)
Madagascar
Painted Chorus Frog (Microhyla butleri)
Taiwan
Painted Indonesian Tree Frog (Nyctixalus pictus)
Malaysia
Painted Reed Frog (Hyperolius marmoratus)
Botswana
Burkina Faso
Mozambique
Pacific Tree Frog (Pseudacris regilla)
Canada
United States
Palm Frog (Sooglossus pipilodryas)
Seychelles
Panamanian Golden Frog (Atelopus zetaki)
Dominica
United Nations, Geneva
Panther Toad (Bufo regularis)
Angola
Paradise Toad (Bufo robinsoni)
South Africa
Peur Tree Frog (Rhacophorus puerensis)
Vietnam
Phantasmal Poison Frog (Epipedobates tricolor)
Netherlands Antilles
Pine Woods Tree Frog (Hyla femoralis)
USA
Plain Grass Frog (Plychadena anchietae)
Venda
Plains Spadefoot Toad (Spea bombifrons)
USA
Pool Frog (Rana lessonae)
Belarus
Great Britain
Russia
Puddle Frog (Phrynobatrachus natalensis)
Zambia
Puerto Rican Crested Toad (Peltophryne lemur)
Dominica
Puerto Rican Whistling Eleuth (Eleutherodactylus cookei)
Bermuda
Species Q-Z
Ranwella's Tree Frog (Polypedates ranwellai)
Sri Lanka
Red Toad (Bufo carens)
Zambia
Red-Eyed Tree Frog (Agalychnis callidryas)
Aruba
Costa Rica
Denmark
Djbouti
Honduras
Jersey
Micronesia
Nicaragua
Vietnam
Red-Webbed Treefrog (Hyla rufitela)
Panama
Vietnam
Robert Inger's Tree Frog (Rhacophorus robertingeri)
Vietnam
Rococo Toad (Rhinella schneideri)
Uruguay
Romer's Tree Frog (Liuixalus romeri)
Hong Kong
Roth's Tree Frog (Litoria rothi)
Australia
Rugulose Rainfrog (Eleutherodactylus rugulosus)
El Salvador
Rusty Tree Frog (Hyla boans)
Suriname
Seychelles Frog (Sooglossus seychellensis)
Seychelles
Seychelles Tree Frog (Megalixalus seychellensis)
Seychelles (ZES)
Siberian Wood Frog (Rana amurensis)
Russia
Siegfried's Rainforest Frog (Albericus siegfriedi)
Papua New Guinea
Silver Marsupial Frog (Gastrotheca plumbea)
Ecuador
Smokey Jungle Frog (Leptodactylus pentadactylus)
Suriname
Smooth-Sided Toad/Spotted Toad (Bufo guttatus)
Suriname
Smooth Spiny Reed Frog/Liberia Banana Frog (Megalixalus laevis)
Tanzania
Solomon Island Leaf Frog (Ceratobatrachus guentheri)
Micronesia
Papua New Guinea
Solomon Islands
Solomon Wrinkled Ground Frog (Platymantis solomonis)
Solomon Islands
Sonoran Green Toad (Bufo retiformis)
United Nations, Vienna
Southern Toad (Bufo terrestris)
USA
Splendid Leaf Frog (Cruziohyla calcarifer)
Honduras
Spurred Big-Eyed Tree Frog (Nyctimystes pulcher)
Papua New Guinea
Squirrel Tree Frog (Dryophytes squirellus)
United States
Stejneger's Narrow-Mouthed Toad (Microhyla inornata)
Taiwan
Strawberry Poison Dart Frog (Dendrobates pumilio)
Costa Rica
Striped Grass Frog (Ptychadena porosissima)
Mozambique
Table Mountain Ghost Frog (Heleophryne rosei)
South Africa
Tailed Frog (Ascaphus truei)
USA
Taipei Frog (Rana taipehensis)
Taiwan
Tandy's Sand Frog (tomopterna tandyi)
Namibia
Tasmanian Tree Frog (Litoria burrowsae)
Australia
Three-Banded Frog (Cardioglossia trifasciata)
Cameroun
Thomasset's Frog (Nesomantis thomasseti)
Seychelles
Tiger-Legged Monkey Frog (Phyllomedusa hypochondrialis)
Suriname
Toad species (Ingerophynus macrotis)
Thailand
Tomato Frog (Dyscophus antongilii)
United Nations, Geneva
Trinidad Golden Treefrog (Phyllodates auratus)
Trinidad &Tobago
Treasury Island Tree Frog (Hyla thesaurensis)
Papua New Guinea
Solomon Islands
Variable Reed Frog {Hyperolius pictus)
Mozambique
Veragua Robber Frog (Eleutherodactylus biporcatus)
Panama
Wallace's Flying Frog (Rachophorus nicropalmatus)
Cambodia
Waterlily Reed Frog (Hyperolius pusillus)
Swaziland
Western Island Tree Frog (Hyla iris)
Papua New Guinea
Western Nimba Toad (Nectophrynoides occidentalis)
Guinea
Woodhouse's Toad (Bufo woodhousei)
Tanzania
Woodworth's Frog (Rana woodwrothi)
Philippines
Yellow-banded Poison-dart Frog (Dendrobates leucomelas)
Venezuela
Vietnam
Yellow-Bellied Toad (Bombina variegata)
Czechoslovakia
Switzerland
Yellow-Bellied Toad (Bombinator pachypus)
Yugoslavia
Yellow Striped Tree Frog (Hyperolius semidiscus)
South Africa