Frogs And Toads On Stamps, Covers And Postmarks.

Aruba
Forest Animals
December 16, 2013
Set of eight, one stamp depicts red-eyed tree frog (Agalychnis calidryas) native to forests from Central America to north-western South America.

United Nations (Geneva)
Endangered Species
May 11, 2017
Set of four, on stamp shows Green Frog (Scaphiophryne marmorata), a species of frog endemic to Madagascar.

Colombia 2020 National Natural Parks of Colombia
Farallones de Cali: the stamp shows Lehmann's poison frog (Oophaga lehmanni) endemic to a small part of western Colombia.
Selva de Florencia: the stamp shows Andean poison frog (Andinobates opisthomelas) endemic to Colombia.

United States
Endangered Species
May 19, 2023
Set of 20, one stamp shows Wyoming toad found only within Mortenson Lake National Wildlife Refuge in Wyoming.

Kyrgyzstan
Red Book of Kyrgyzstan
September 6, 2019
Set of four, one stamp depicts Central Asiatic frog (Rana asiatica, Bedriaga).

Canada
Endangered Frogs
April 15, 2024
The stamp set features Oregon spotted frog (Rana pretiosa) and Fowler's toad (Anaxyrus fowleri).

Two from Sweden:

European Green Toad (Bufo viridis), designed by U. Frank, engraved by
Arne Wallhorn and issued on September 6, 1979:

European Tree Frog (Hyla arborea), designed by Ingalill Axelsson, engraved by Lars Sjööblom and issued on January 31, 1989:

Frogs, stamps on maxi cards, issued for use in Venda on November 26, 1982:

- Angola River Frog (Rana angolensis)
- Grey Foam-nest Treefrog (Chiromantis xerampelina)
- Mozambique Forest Tree Frog (Leptopelis mossambicus)
- Anchieta's Ridged Frog (Ptychadena anchietae)

Frogs and Toads, issued by Laos on February 1, 1993:

- Asian Painted Frog (Kaloula pulchra)
- Muller's Platanna (Xenopus muelleri)
- Glass Frog (Centrolenella vireovittata)
- Cane Toad (Bufo marinus)
- European Tree Frog (Hyla arborea)

Romania
November 12, 2024
Set of four, one stamp depicts European tree frog (Hyla arborea) found in Romania from lowlands up to over 1000 meters in the Carpathian Mountains.

"The Frog Prince" fairy tale set on cover, issued by Germany on October 5, 1966:

Crowned frog on the FD commemorative postmark:

Tunisia
Endangered Species
December 25, 2024
The stamp depicts Carthaginian tree frog (Hyla carthaginiensis), a species of tree frog found in humid coastal areas of northeastern Algeria and northwestern Tunisia.

Tajikistan
Fauna - Frogs
January 1, 2024
The stamp set shows Peckaboo, Marsh Frog, Red-Eyed Tree Frog, Atlantic Toad.

Amphibians of Israel, a set of four stamps, two show frogs, issued by Israel on June 23, 2014:

Syrian Spadefoot (Pelobates syriacus)
[and Near Eastern Fire Salamander (Salamandra infraimmaculata)]

Hula Painted Frog (Latonia nigriventer)
[and Southern Banded Newt (Ommatotriton vittatus)]

Thay do Coc (The Frog Teacher) is a Vietnamese folk allegory that teaches the value of humility and wisdom. It tells the story of a frog who opens a school to teach other animals but is mocked for his appearance and perceived lack of intelligence. However, the frog proves to be a wise and capable teacher, imparting valuable lessons to his students. The tale emphasizes the importance of judging others by their character and knowledge rather than their outward appearance.

The Frog Teacher, issued by North Vietnam on January 30, 1972: