Source : Webster's Revised Unabridged Dictionary (1913)

Wriggler \Wrig"gler\, n.
   One who, or that which, wriggles. --Cowper.

Source : WordNet®

wriggler
     n 1: one who can't stay still (especially a child); "the toddler
          was a real wiggler on plane trips" [syn: {wiggler}, {squirmer}]
     2: larva of a mosquito [syn: {wiggler}]