The Collaborative International Dictionary of English v.0.48:

Toadfish \Toad"fish`\, n. (Zool.)
   (a) Any marine fish of the genus Batrachus, having a large,
       thick head and a wide mouth, and bearing some resemblance
       to a toad. The American species (Batrachus tau) is very
       common in shallow water. Called also oyster fish, and
       sapo.
   (b) The angler.
   (c) A swellfish.
       [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):

toadfish
    n 1: bottom-dwelling fish having scaleless slimy skin and a
         broad thick head with a wide mouth [syn: toadfish,
         Opsanus tau]