Post Cereals introduced Honey-Comb in 1965, adding to a line of cereals that had gained national attention thanks to an ad campaign, and, subsequently, the Linus the Lionhearted cartoons.
Honey-Comb's mascot originally was the Honeycomb Kid, a cowboy hero who could ride on two of any animal, be it horses, buffalo, polar bears, or dolphins. Not sure if Ed Graham's team worked on these ads, though I'd not be surprised if some of the same voice talent that worked on Linus also did these ads.
Here's a sample:
As you could probably guess, Post and its advertising agency were riffing on Jimmie Rodgers' 1957 hit, "Honeycomb". Unfortunately, the Kid rode off into the sunset well before the end of the 60's, as, to tell you the truth, this marks the first time I've actually seen more than one of these ads.