tadpole
(also ‘polliwog’, ‘pollywog’, ‘polliwig’)

a tadpole
the larval stage (young) of a frog or toad (amphibian) which spends this part of its life cycle completely in water; has external or internal gills, long, flat tail, and legs showing up gradually {in the later stages it loses its long tail and gills, and changes into a full-grown adult}
Figures of Speech:
tad or tadpole (noun) = a young person, especially a boy
tad or tadpole (noun) = a young person, especially a boy
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