I got the Monblin and Moriblin from the
OoT Perfect Guide from Versus Books (some game guide publisher that lasted for only about 5 years; Casey Loe, who is currently a reporter in Nintendo Power, America's Nintendo magazine, worked as a writer at Versus Books). So maybe (or maybe not) they are all just Moblins. I think it would be easier to call them Moriblins and a Monblin, since there would be so many Moblins, and that would make things more confusing.