First, if you're playing as a Drow or half-Drow, you won't need any checks. And you can attack the grove with the goblins. That's what you're talking about, right?
This also applies if you use the mage disguise. Goblin at the gate will automatically start off friendlier if you appear as a drow than any other race.
In this run I sneaked in the blighted village near the group of goblins that kidnapped the deep gnome. The leader talked to my character (a full drow tadpole enhanced
), I choose the tadpole power option, it was an easy win (the roll was against a 1), obviously the little fella had trembling knees and almost peed himself and decided to go away with his pack.
Now is the point when things got weird (to me as a player, my Tav just shrugged and cleaned the village): after the cutscene the goblin leader and his troupe became hostile and engaged a battle. As I said I was surprised because the double feature Pure Drow and tadpole implanted should make goblins bow and put their tail, had they one, between their legs in submission.