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a small animal with smooth skin, that lives both on land and in water (= is an amphibian). Frogs have very long back legs for jumping, and no tail. 蛙；青蛙 
the croaking of frogs 蛙鸣 The frog jumped into the pond. 青蛙跳进了池塘。 There are three native species of frogs and toads in the UK. 在英国，青蛙和蟾蜍有三种原生物种。
Oxford Collocations Dictionaryfrog + verb- hop
- jump
- croak
- …
- spawn
- frogs’ legs
- Frog(taboo, slang)
an offensive word for a French person 法国佬（对法国人的蔑称）
Word OriginOld English frogga, of Germanic origin; related to Dutch vors and German Frosch. Used as a general term of abuse in Middle English, the term was applied specifically to the Dutch in the 17th cent.; its application to the French (late 18th cent.) is partly alliterative, partly from the reputation of the French for eating frogs' legs.
Idioms
have, etc. a frog in your throat
to lose your voice or be unable to speak clearly for a short time （暂时）失音，嗓音嘶哑