The figures I've come up with to represent these uncouth but strong warriors are Gaels from I-Kore's old Celtos range of fantasy miniatures. I like these figure because first they wear kilts not loincloths. So many fantasy figures are sculpted wearing loincloths the peoples of Middle Earth don't wear loincloths! Second because the Celtos range has a equal amount of female warriors in their unit packs. The Celtos figures don't seem too bulky next to the GW LOTR figures to me.
From left to right GW Last Alliance Elf. Celtos Gael, Mordor Uruk-hai, Celtos Gael
Again the Last Alliance Elf next to several Celtos Gaels.