Some examples from Paul Jung's tenure as the mascot for Kellogg's Sugar Smacks. Various clowns were used on the boxes from 1953 to 1956. The first two were Lou Jacobs and Paul Jung from 1953 through 1954. Then Cliff "Cliffy" Sobier from ABC-TV's Super Circus took over for 1955 and the last to be used was Charlie Bell in 1956. It was then that Kellogg's replaced them all with a seal named Smaxey.
It would have been nice if the series had continued and circus clowns had a place to be recognized the way athletes do on boxes of Wheaties.