Wackelkopffigur
Wackeldackel → κουκλάκι με κινούμενο κεφάλι, κουκλάκι με κεφάλι που κουνιέται, λούτρινο με κεφάλι που κουνιέται
bobblehead doll
A bobblehead, also known by common silly nicknames such as nodder, wobbler, or wacky wobbler, is a type of small collectible action figure. Its head is often oversized compared to its body. Instead of a solid connection, its head is connected to the body by a spring or hook in such a way that a light tap will cause the head to move around, or "bobble", hence the name.
Bobblehead - Wikipedia