This has been retconned or misinterpreted since there are tuskarr in the Darkmoon Faire and one in Pandaria.
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Most Tirasians are just average humans though and use the standard human model.
OT: I was split between ogres and vrykul, but I ultimately chose vrykul. I love the Norse themes and the barbarian aspect (the Alliance definitely needs more brutish races, especially with the Horde having two elf races).
Vrykul can easily be shrunken down in-game to tauren-size, while ogres in lore only average 8 feet tall (females being a foot shorter). Making them on par with trolls and tauren in terms of height.