The Collaborative International Dictionary of English v.0.48:

Tomtate \Tom"tate\, n.
   A Florida and West Indian grunt (Bathystoma rimator or
   Haemulon rimator); also, any of various allied species.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

tomtate
    n 1: found off the West Indies and Florida [syn: tomtate,
         Haemulon aurolineatum]