The Collaborative International Dictionary of English v.0.48:

Frogmouth \Frog"mouth`\, n. (Zool.)
   One of several species of Asiatic and East Indian birds of
   the genus Batrachostomus (family Podargid[ae]); -- so
   called from their very broad, flat bills.
   [1913 Webster]

WordNet (r) 3.0 (2006):

frogmouth
    n 1: insectivorous bird of Australia and southeastern Asia
         having a wide frog-like mouth