Which of these food brand mascots never actually existed in commercial advertising?

Brand mascots have been selling us food products for decades, becoming cultural icons in their own right. From cereal characters to fast food representatives, these colorful personalities have shaped our purchasing decisions and brand loyalty. This trivia challenge tests your knowledge of food mascots throughout advertising history. Can you identify which character was never actually used to promote food products?

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Professor Crumb, the bespectacled baker for Pepperidge Farm who carried a ruler to measure the perfect cookie thickness (1970s)
Charlie the Tuna, the beret-wearing fish who wanted to be caught by StarKist because of his good taste (1961)
Julius Pringles, the mustachioed face on Pringles potato chip containers (1967)
Poppin' Fresh, the Pillsbury Doughboy who giggles when poked in the stomach (1965)