Knut Köffelström

From Muppet Wiki

Knut Köffelström is a rabbit salesman who appeared on Sesamstrasse in episode 2406. Knut comes by when Nils' shop shelves collapse. He talks Nils into buying his new shelves, the Köffelström 3000. Rumpel is convinced he can make one that's better than the Köffelström 3000. However, it turns out they are both badly constructed.