If you want to kill Frostclaw, then just yell this weekend and I will get Leyn'a (fast) or Brem (slow, but safe) and we will kill him.
Now if you want to kill Snowblind or Gargath we would need a few more for that. Depending on the time, could most likely get few from CA or pug and pull either off rather easily. Pretty much will do anything below Nightmare Pilgrim (Voss WB) with a few decently equipped 50s and a decent tank. Voss WB takes a full well equipped Ops team.