Frog, a well-known amphibious animal of the genus Rana. The mention of this reptile in the Old Testament is confined to the passage in Ex. 8:2-7, etc., in which the plague of frogs is described, and to Ps. 78:45; 105:30. In the New Testament the word occurs once only, in Rev. 16:13. There is no question as to the animal meant. The only known species of frog which occurs at present in Egypt is the Rana esculenta, the edible frog of the continent.