This noun denotes frogs, the amphibious creatures familiar from marshes and streams. John uses it in Revelation 16:13, where he sees 'three unclean spirits like frogs' coming from the mouths of the dragon, the beast, and the false prophet. The imagery evokes the plague of frogs in Exodus, a divine judgment on Egypt. In Revelation, the frog-like demons gather the kings of the earth for the battle of Armageddon—a grotesque, plague-like mobilization of evil. Classical usage includes literal frogs and the fishing-frog (angler fish). John's apocalyptic βάτραχοι symbolize unclean, pestilential spirits that seduce the nations into final rebellion.