The Collaborative International Dictionary of English v.0.48:

Frogfish \Frog"fish`\, n. (Zool.)
   (a) See Angler, n., 2.
   (b) An oceanic fish of the genus Antennarius or
       Pterophrynoides; -- called also mousefish and toadfish.
       [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Angler \An"gler\, n.
   1. One who angles.
      [1913 Webster]

   2. (Zool.) A fish (Lophius piscatorius), of Europe and
      America, having a large, broad, and depressed head, with
      the mouth very large. Peculiar appendages on the head are
      said to be used to entice fishes within reach. Called also
      fishing frog, frogfish, toadfish, goosefish,
      allmouth, monkfish, etc.
      [1913 Webster]

WordNet (r) 3.0 (2006):

frogfish
    n 1: fish having a frog-like mouth with a lure on the snout