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The two "Stalks" appeared with Green Heap and Purple Heap in The Muppet Show: Sex and Violence sketch titled Aggression. The characters are listed in the script as Pink Stalk and Gold Stalk however in the original script dialog they refer to each other as "George" and "Martha".
They look like talking fuzzy bananas with beady eyes. The gold stalk, referred to as "Melg", is performed by Jerry Nelson. The pink stalk, "Xomfey", is performed by Fran Brill.
They speak in gibberish, with a slightly distinguished accent; they are obviously more civilized than the Heaps.