Big Bob is a anthropomorphic rat that appeared in the "Bakers" episode of Bert and Ernie's Great Adventures

When Ernie and Bert are working in a bakery, they get a call from Big Bob, who makes a huge order for "Chocolate Surprise", a pastry they're never even heard of before, and he wants it in only a short while. The two make a big mess while trying to figure out the recipe. Big Bob arrives, and is very pleased with their work, as their mess turns out to be exactly the Chocolate Surprise that he had ordered.