Frog in Wikipedia
Frog. - Though not rare in Israel, this word is only mentioned in the Old Testament in connection with the second plague of Egypt. Two species of frogs are known to live in the Holy Land: the rana esculenta, or common edible frog, and the hyla arborea, or green tree-frog. The former throngs wherever there is water. In Apoc., xvi, 13, the frog is the emblem of unclean spirits.