The Collaborative International Dictionary of English v.0.48:

Drumfish \Drum"fish`\, n. (Zool.)
   Any fish of the family Sci[ae]nid[ae], which makes a loud
   noise by means of its air bladder; -- called also drum.
   [1913 Webster]

   Note: The common drumfish (Pogonias chromis) is a large
         species, common south of New Jersey. The southern red
         drum or red horse (Sci[ae]na ocellata), and the
         fresh-water drum or croaker (Aplodionotus grunniens),
         are related species.
         [1913 Webster]

WordNet (r) 3.0 (2006):

drumfish
    n 1: small to medium-sized bottom-dwelling food and game fishes
         of shallow coastal and fresh waters that make a drumming
         noise [syn: drum, drumfish]