These little toothless leghumping fudgepacking bastards have cost me more experience than I care to tell. I've been ambushed by one before while on a CR to MM, and just now died to two that conned RED to me at 35. They are definitely not 33.
Be warned, they're root spell does 50dd and usually lasts longer than you can live, (yes even with LOH)
I did get a stun off on one of em this time, so I'd guess they're 40ish