Frogfish are small, round-bodied marine fish that belong to the anglerfish group. They live in warm tropical seas, such as the Indo-Pacific, and usually walk along the bottom on modified fins instead of swimming. Their bumpy, often colorful skin lets them blend in with sponges, coral, and rock.
A frogfish hunts by waiting. A modified fin on its head works as a lure to draw small fish close, and its mouth can expand very quickly to swallow prey as large as the frogfish itself. They lay eggs in a jelly-like raft. The warty frogfish, one common species, is listed as Least Concern by the IUCN, although frogfish in general have limited ranges and can be affected by climate change.
Source: Aquarium of the Pacific: Warty Frogfish
Image: Frogfish in aquarium, by Bildflut, CC0, via Wikimedia Commons.