One who can't stay still (especially a child):
— The toddler was a real wiggler on plane trips.

synoniemen: squirmer, wriggler.

Pools: wiercioch, żywe srebro, iskra, fryga, wiercipięta

Larva of a mosquito.

synoniem: wriggler.

Terrestrial worm that burrows into and helps aerate soil; often surfaces when the ground is cool or wet; used as bait by anglers.

synoniemen: angleworm, crawler, dew worm, earthworm, fishing worm, fishworm, nightcrawler, nightwalker, red worm.

Nederlands: aardworm, pier, regenworm
Pools: glizda, dżdżownica