I used to love Cocoa Krispies cereal, and I suspect these series of commercials had a lot to do with it. they aren't particularly funny or imaginative, but they use the words "chocolate" and "dinosaur" a lot. that would have been good enough for me at that age.
I'm pretty sure I saw these. I was a little offended when Cocoa Pebbles showed up. the stop-motion in this commercial is quite nice. I wonder if Cascade did it.