this technique is called worm grunting, and it acts as a worm call

Worm Grunting Stick Tool Worm Gitter Earthworm Collector Burlap Drawstrip Storage Bag Wooden : : Sporting Goods

Excitation of Faraday-like body waves in vibrated living earthworms

Why do worms come out when it rains? - Gulo in Nature

Is this sitar worth anything ? : r/Sitar

With fishing season upcoming, you may want to try worm grunting for bait

How worm grunters charm earthworm bait

DIY: Earthworms Can't Hide When 'Grunters' Are Hunting - Game & Fish

Worm grunting - charm earthworms out of the ground - with Worm Gitter

This weird trick will help you summon an army of worms - Kenny Coogan

Fiddling your way to fresh bait

Worm Grunting Stick Tool Worm Gitter Earthworm Collector Burlap Drawstrip Storage Bag Wooden : : Sporting Goods

Worm charming - Wikipedia