No they can’t be frozen. Only vuln applies. These things take forever to kill because most of my kit is all based off CC. That dungeon with doors you have to break have the same problem.
These things alone show part of the sorc issues. We do nothing except when you can chill, freeze, stun. When you can do those things, things tend to melt or blowup. When you can’t you might as well not bother because you’ll be there an hour. There is no in between. The power curve is terrible. Especially when you make things intentionally not CC’able. You either do no damage or a ton of damage.