Quite a bit, actually! They're more or less the only people you have come into contact with beside your father. They operate out of a base they built inside some of Hoth's naturally occuring caves. Generally, they're scavengers and raiders. They have a few starships and lots and lots of guns.
Your father is not a fan of them, to put it lightly. He says you have to cooperate with them for now; it's how you get any supplies, lacking a ship yourself.