In 1977-78 i bought a sci fi paperback, I remember titled "Planet of the Gworfs"( or perhaps planet of the "Gwarfs") The cover featured your standard, over the top 70's sci fi cover painting with garish green colors, some kind of wolfman-looking creature and a large toad. It may have been a compendium, but I recall it being a short novel, approx 200-250 pages. Can anyone help me pinpoint this thing????
A(n incrementally refined) Google Images search for
The cover graphic looks a lot like what you describe: It contains
According to this blogpost, the story first appeared in 1978.