Longman Dictionary of Contemporary English
frog
frog /frɒɡ $ frɑːɡ, frɒːɡ/ BrE AmE noun [countable]
[Language: Old English; Origin: frogga]
Oxford Advanced Learner's Dictionary
frog
frog [frog frogs] [frɒɡ] 
[frɔːɡ] 
[frɑːɡ] noun
Cambridge Advanced Learner's Dictionary
Frog
Frog (PERSON) /frɒg/ US /frɑːg/
noun [C] UK OFFENSIVE
a French person
frog
frog (ANIMAL) /frɒg/ US /frɑːg/
noun [C]
a small animal which has smooth skin, lives in water and on land, has long powerful back legs with which it jumps from place to place, has no tail, and is usually greenish-brown in colour:
Frogs make a low noise called a croak.
Collins Advanced Learner’s English Dictionary
frog
[frɒ̱g, AM frɔ͟ːg]
frogs
1) N-COUNT A frog is a small creature with smooth skin, big eyes, and long back legs which it uses for jumping. Frogs usually live near water.
2) N-COUNT Frogs is sometimes used to refer to French people. This use could cause offence. [INFORMAL]