Kellogg's Cocoa Krispies has gone through a number of mascot characters over the last 60 years. Currently, Snap, Crackle, & Pop appear on boxes of both Rice & Cocoa Krispies, the latter on their 2nd tour of duty.
Around the end of 1973, Kellogg's and their advertising agency replaced Ogg the Caveman with Tusk, an elephant who wore glasses, which in turn is unusual in and of itself. The redoubtable Paul Winchell is the voice of Tusk and sings the jingle du jour.
Tusk departed in 1982, replaced for a time by Snap, Crackle, & Pop. It's a shame.