Pucka is a beta enemy that was intended to appear in the game Donkey Kong Land. He was scrapped because of unknown reasons. Pucka's only appearance was an issue of the Nintendo Powe magazine. Pucka, judging from his Nintendo Power entry, is an underwater enemy who is apparently a large fish in a small sea. Not much else is known about him.
Gloops are enemies that are only seen in Donkey Kong Land. They are small black and white angelfish. Apparently, they almost closely resemble the unused enemy, Pucka. And the irony is that Gloops are the smaller relatives to the larger Fangfish, who, in the pre-release development stage of the game, is called Pucka Jr., obviously making the Fangfish the larger relative of Pucka.