Digger the Dermatophyte is the mascot of a series of Lamisil toe-fungus advertisements.[1]
In "Boopa-Dee Bappa-Dee", Peter tires to dismiss the idea of traveling to Europe based on Lois' suggestion that the kids could learn some culture by noting that he has more culture in his toe. A close-up reveals Digger singing opera. When the scene returns, Peter notes that he has ringworm as well but it isn't classy like Digger.
In "Run, Chris, Run", Cleveland and Jerome turn on the television at The Drunken Clam in time for a Lamisil commercial, leaving them to ponder exactly what he is supposed to be.