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In an IDW Publishing backup strip that appeared in multiple issues of different IDW comics, Raphael notes that before Picasso, another turtle known as Warhol tried joining the turtles—which turned out to simply be a can of Campbell's turtle soup.
Warhol is obviously named after late American artist Andy Warhol, and its (his?) appearance as a can of Campbell's turtle soup is a reference to Warhol's famous 1962 painting, Campbell's Soup Cans.