Yes. Those nuts are your typical "righty tighty, lefty loosey".
What Robo means is if the outer tie rod is worn on the inside (which you can't see), it's possible that they won't center themselves and get stuck. If you align the rear end to a stuck tie rod, one good bump or pothole and your alignment is back to shit.
I assume you're planning on adjusting it yourself. I suggest getting an actual 4 wheel alignment done. If the rear tire has that much negative toe, you aren't going to get it back to normal without a machine. The rear alignment is usually set at about -.10* toe as it is. If something has caused it to go that much farther negative (toe in), your camber is affected as well.
Yes you may get it back to somewhat normal, and it might be fine. I'm just putting possibilities on the table. It's just a concern that something may very well be messed up and need repair.