Krals were a race of the Karku-species, Ape-like creatures often believed to be akin to both Men and Trolls. There were two different groups, the northern Ice-Krals and the eastern or southeastern sea-krals.
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Krals were originally invented by ICE for their Loremaster (ICE Series) and later Rolemaster settings. If re-adapted to a middle-earth background, they should probably be reconsidered as Eastern Orcs, though they also could be a sub-group of man which had escaped Morgoth's experiments, similar to the Drúedain, or they could be degenerate men, warped by the Shadow.