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

synonyms: squirmer, wriggler.

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

Larva of a mosquito.

synonym: wriggler.

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

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

Dutch: aardworm, pier, regenworm
Polish: glizda, dżdżownica