The Collaborative International Dictionary of English v.0.48:

Crapaud \Cra*paud"\, n. [Written also crapawd, crapald,
   crepaud, etc.] [F. crapaud.]
   1. A toad. [Obs.]
      [Webster 1913 Suppl.]

   2. (Pronounced kr[.a]`p[=o]") As a proper name, Johnny
      Crapaud, or Crapaud, a nickname for a Frenchman.
      [Webster 1913 Suppl.]

   3. large toothed frog of South and Central America
      (Leptodactylus pentadactylus) resembling the bullfrog.

   Syn: South American bullfrog, Leptodactylus pentadactylus.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

crapaud
    n 1: large toothed frog of South America and Central America
         resembling the bullfrog [syn: crapaud, South American
         bullfrog, Leptodactylus pentadactylus]