The Collaborative International Dictionary of English v.0.48:

Hornpout \Horn"pout`\, n. (Zool.)
   See Horned pout, under Horned.
   [1913 Webster]

WordNet (r) 3.0 (2006):

hornpout
    n 1: catfish common in eastern United States [syn: horned
         pout, hornpout, pout, Ameiurus Melas]