From the annals of Muppet lore

Brian Henson Introductions - Muppet Wiki - Wikia: "The staff received a memorable letter from a Scandinavian businessman who saw the show while on a trip to London. He wrote to inform my father that The Muppet Show's so called Swedish Chef did not actually speak any real Scandinavian language, not even Swedish. The Muppet Show head writer Jerry Juhl sent a reply, saying "Thank you for bringing this to our attention. We were going to fire the Chef on the spot, but he has got a wife and family and he promises to take Swedish lessons.""