I've been playing around with the Troll quite a lot recently, so I thought I'd leave some feedback.
First of all, Blink and Knockback on the same monster seems kind of janky - when you kill the blinking monster it will push you in a different direction than it should have. Not very significant, but just seems strange.
As for the gameplay, here are some insights I have so far:
I'm currently trying to tackle Curious Naga City with a Troll, and I'm having a rough time - as of yet I haven't made it past the first wave. I'm not sure if that means it's weak, I can't play it well, or Curious Naga City is very hard. Probably the last one, because this class has no trouble killing 3 level higher monsters even on Vicious difficulty, and the amount of blackspace it has remaining makes it a powerhouse at killing bosses, too.
I'm running Frozen Crown and Dracul at the moment. Frozen Crown is about as strong as I thought it was - a much stronger Whurrgarbl with a downside that doesn't matter too much for the Troll. However, I think I'm going to have to switch out the Frozen Crown for something else here, because there are too many physical-resistant bosses for it to be feasible. I'm going to try a Draining Blade build instead, possibly with Jehora to start so I can still level properly (the Troll has some trouble with Naga City's monster set).