Most of what I know about them is from my own
observations. The body of an adult frogfish is easily
the size of a human's head. One of my first impressions
upon seeing one come teetering around the corner of a
coral head, giving me a semi-profile view, was that it
looked just like the head of "The Duchess"
from "Alice in Wonderland".
They are usually found nicely camouflaged on the side
of a coral head or amongst the coral growing on the side
of a lava rock ledge awaiting whatever "meal"
they can lure in.
The frogfish is a type of angler fish. Angler fish all
have a lure with which they attract small fish (in the case
of the frogfish, it is the little tuft atop the head), and
large mouths with which to gulp up their prey.