Probably everyone's familiar with Jack Davis, one of the most well-known and prolific cartoonist/illustrators of all time. There's not a single product he hasn't done, except maybe pornography (unless you count PLAYBOY).
Dell's FOUR COLOR COMICS was mainly a tryout for potential series and one-shots. Mostly Dell did licensed characters, but here's one exception. There were only two issues of YAK YAK as part of the FOUR COLOR series, and this was sort of a departure for them. Rarely did they ever showcase any artist.
Before he became a regular for (post-Kurtzman) MAD, Jack Davis did all sorts of things for other humor magazines. Dell gave him a chance to write and draw some comics of his own, similar to a series from his college days, BULL SHEET.