This BMC penguin bobblehead is solid novelty.  It is about 6 inches tall.  I obtainted it from a conference about 6 years ago.

This bobblehead is basically a toy or collectible image that has an oversized head which wobbles on a spring connected to the torso of the toy or collectible image. Since the head wobbles or “bobbles”, the term used to describe such a toy or collectible image became bobblehead.