Commentaries:
The ancient Egyptians had a god name Ptah, represented by a man's body with the head of a frog. For the second plague God sent an infestation of millions of frogs. For the Egyptians, this was too much of a good thing! Moses writes that they got into the houses, into the beds and ovens and kneading bowls (verse 3). When God lifted the plague, these millions of frogs died and stank the country up for days (verse 14).
Mike Ford
Animal Idolatry