What is Frog ?
Frog is (noun) 1. a small greenish-brown animal with long legs, which hops, and lives both on land and in water He kept some tadpoles in a jar hoping they would turn into frogs. Can you hear the frogs croaking round the pond? 2. to have a frog in your throat to have something in your throat which stops you speaking clearly (informal.)
source: Easier English, Student Dictionary Upper Intermediate Level