Noun
A member of a hybrid species of frog, Pelophylax kl. esculentus, a hybrid of the pool frog (Pelophylax lessonae) and the Central Asian marsh frog (Pelophylax ridibundus).
Lithobates clamitans, a North American frog.
Used other than figuratively or idiomatically: see edible, frog.
Source: en.wiktionary.org