Remathilis said:
Halflings
Lightfoot Halfling/Hairfeet
Tallfellow Halfling
Deep Halfling
Strongheart
Ghostwise
Jerrin/Cannibal Halflings (BoVD, no relation to Athasian)
Orc
Common
Mountain
Grey Orc
Orog
Orgallion
Half-Orc
For halflings, you can also add our Amberhair, aka Golden, halflings ("azravan").
As Psion mentioned, there are also more KoK orcs - the Black ("urar ukak"), Brown/Desert ("chagun ukak"), White/Snow ("nukugh ukak"), plus the Common ("ukak") and Gray/Deep ("nogror ukak").
Oh, and I don't remember if anyone has mentioned hobgoblins. The KoK setting has two hobgoblin kingdoms, plus various tribes, so there are subraces for these as well. These are named for their regions, rather than climate or color, but they have different stats. These are the -
Krangi (of the Kingdom of Norga-Krangrel)
Kargi (of the Kingdom of Ul-Karg)
Kors (of the P'Tikor hills)
Dazlak (of the Khydoban Desert, where Korrut pi Dazlak led them long ago)
Rankki (of the northern Khorren Woods, which they call the Rankagh).