lizard fish

n.
  1. Any of several mostly tropical marine scopeloid fish of the family Synodontidae having large mouths in lizardlike heads, especially the inshore lizardfish (Synodus foetens syn. Synodus poeyi) of Mideastern and Southern United States and West Indies; -- sometimes called sand pike.

A freshwater perch, the sauger, a different fish, is also called the sand pike.