Muchamp Champignons is a Dutch company that produces mushrooms. According to their Facebook page, (translated) "Muchamp Mushrooms is a nursery where mushrooms are harvested manually. 27 tons of fresh mushrooms are produced weekly."
In the late 1980s, the Muppets appeared in a commercial for the company. Kermit the Frog (puppeteered by Rick Lyon and dubbed in Dutch by Wim T. Schippers), wore his Manhattan Melodies sweater along with Beauregard, Louis Kazagger, Lips, Smilin' Ed, Bobby Benson, Zoot, Animal, Floyd Pepper, and a number of Whatnots.