WordNet (r) 3.0 (2006):

small fry
    n 1: someone who is small and insignificant [syn: pip-squeak,
         squirt, small fry]
    2: a young person of either sex; "she writes books for
       children"; "they're just kids"; "`tiddler' is a British term
       for youngster" [syn: child, kid, youngster, minor,
       shaver, nipper, small fry, tiddler, tike, tyke,
       fry, nestling]

Moby Thesaurus II by Grady Ward, 1.0:

70 Moby Thesaurus words for "small fry":
   a nobody, a nothing, babyhood, bantam, banty, boyhood, button,
   childkind, children, chit, cipher, common man, diminutive, dinky,
   dummy, featherweight, figurehead, fingerling, girlhood,
   insignificancy, insignificant, jackstraw, kids, lesser,
   lightweight, little fellow, little guy, little kids, man of straw,
   mediocrity, mini, minikin, minnow, minny, mouse, nebbish,
   new generation, nobody one knows, nonentity, nubbin, obscurity,
   peewee, pip-squeak, pony, punk, rising generation, runt, scrub,
   secondary, shrimp, slip, small, small potato, small potatoes,
   small-time, snip, snippet, squirt, squit, tit, tots, wart, whiffet,
   whippersnapper, wisp, young, young blood, young fry, young people,
   youth