The great comic book cartoonist, Howard (Howie) Post, did some great characters for Marvel Comics back in 1972 within the pages of "Li'l Pals: Fun-Filled Animal Antics"!
Howie Post is best known for his work for Harvey Comics, where he had a hand in developing Hot Stuff the Little Devil and Spooky the Tuff Little Ghost. Here are a couple of articles discussing Howie's work.
Seems that Melvin Monkey is a greedy, manipulative little character who is always trying to take advantage of his neighbor Boinard Bear. Check out their first adventure here from the first issue of Li'l Pals.