Well, when I created Truk and Trukk too, right after char creation, the subrace skin was applied and also got booted. I relogged and apart from the fact that Truk has the head of a Halfling and the body of a Goblin, he is fine. (And I have only one stat below 10, Charisma is 6 (after the skin is applied) all others are 10 or above)
So I guess you can play Grwlz alright, as long as the stat are as faldred stated.
If you need the Half-Giant's skin to be customized, then yes, I believe you need GM help.