pol·li·wog also pol·ly·wog (pŏl'ē-wŏg', -wôg') n. See tadpole.
[Variant of polliwig, from Middle English polwigle : pol, head; see poll + wiglen, to wiggle; see wiggle.]
tad·pole (tād'pōl')
(click for larger image in new window) n. The limbless aquatic larva of a frog or toad, having gills and a long flat tail. As the tadpole approaches the adult stage, legs and lungs develop, and the tail gradually disappears. Also called polliwog.
[Middle English taddepol : tadde, tode, toad; see toad + pol, head; see poll.]