Hi! I'm Jen and I'm the brain behind Doug Ramsey, Jennifer Stavros (betonroulette), and an OC, Tamsin Doniger (canbeaweapon).
Rogue would definitely know Doug and Tamsin, as both are Institute residents (and Tamsin's a teacher). How well she knows them is up to you, obviously, but I'm thinking she gets along with Tamsin well enough to have a conversation but they're not terribly close. And as for Doug... she might get along with him better simply by virtue of the fact that he's so dorky that it's hard NOT to like him. My two cents, of course, your mileage may vary.