Alfredo and Hildegard

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Alfredo and Hildegard, The Mop Dancers performed in episode 309 of The Muppet Show when Kermit sent them onstage to sweep up the broken plates from the Miss Piggy's opening number, "Never On a Sunday."

Alfredo is the feminine-looking gray-skinned Whatnot, and Hildegard is the masuline-looking, hairy green-skinned Whatnot, which leads to confusion when Kermit wishes "Hildegard" good luck and she snaps back, "I'm Alfredo!"