This is the Thirsty head for the Transformers Prime RID deluxe Vehicon figure! It comes in 3 pieces which you have to put together: the head, the light pipe and tongue. The head pops on easily on the figure's neck ball, and the tongue attaches to its mouth via 3mm peg.
The head is designed to fit into the Vehicon's alt mode, but the tongue needs to be detached.
This model has been successfully tested in Frosted Ultra Detail.You can order a set of three heads here.TFW2005 thread here.Flickr here.