\Frost`fish"\, n. (Zo["o]l.)
(a) The tomcod; -- so called because it is abundant on the
    New England coast in autumn at about the commencement of
    frost. See {Tomcod}.
(b) The smelt. [Local, U. S.]
(c) A name applied in New Zealand to the scabbard fish
    ({Lepidotus}) valued as a food fish.