Mr. Twiddle

Mr. Twiddle is the zoo keeper in the Wally Gator shorts of The Hanna-Barbera New Cartoon Series. He was voiced by Don Messick.

Harvey Birdman
In "SPF" he's sued by Ding-a-Ling for using a porn website with Ding-a-Ling's name in it.

Wacky Races (2017) cameo
In the episode "The Wacky Always Races Twice" he was seen among the "Low Lives" that Penelope Pitstop and Peter Perfect mentioned.