Pyornkrachzark is a member of the rock chewers, and lives on a diet of only rocks. One bite is enough to get most rock chewers to the end of a month. All rock chewers use stone for everything they need, from furniture to toys or vehicles. Pyornkrachzark had a bicycle that looked rather like a steamroller with pedals until he became hungry and ate it. He was chosen as a messenger to tell The Childlike Empress of the Nothing and ask for help. Along the way he met Gluckuk and Vooshvazool, and soon Blubb. They all became good friends and stayed together. But that's another story and shall be told another time.
In the movies, Pyornkrachzark is simply known as Rock Biter, or Rockbiter. An uncredited Alan Oppenheimer plays the Rock Biter in the first film, but in the second film, the replacement actor is never credited at all, so it remains unknown to this day.