“And I saw three unclean inspired expressions that looked like frogs come out of the mouth of the dragon and out of the mouth of the wild beast and out of the mouth of the false prophet.

Revelation 16:13,

What, though, is “the false prophet”? This is a newcomer in name only. Previously, we were shown a wild beast with two horns like a lamb that performed great signs before the seven-headed wild beast. This deceptive creature acted like a prophet for that wild beast. It promoted worship of the wild beast, even causing an image to be built to it. (Revelation 13:11-14) This wild beast with two horns like a lamb must be the same as “the false prophet” mentioned here. Confirming this, we read later that the false prophet, like the symbolic wild beast with two horns, “performed in front of [the seven-headed wild beast] the signs with which he misled those who received the mark of the wild beast and those who render worship to its image.”​—Revelation 19:20.