BOBBLEHEAD
Bobblehead
A bobblehead doll, also known as a bobbing head doll, nodder, or wobbler, is a type of collectible toy. 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 bobble, hence the name.The above text is a snippet from Wikipedia: Bobblehead
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