Sandworm is a type of creature that lives on Titan, a dusty moon for Saturn.
While they don't speak, there is a interesting cartoonish reaction when one is hit. Seems as through they have the personality like a dog.
Sandworms live in sand all their lives. Nothing more.
For more information of the animated version of this character go to the animated article.
There are real sandworms, but they are nothing like their movie and cartoon counterparts.