Build a hatching pen as you would a taming pen hatch a level 120 plus wyvern and let it sit in the pen then find a high level troodon and drop it in the pen I recommend hatching 2 wyverns but that is the best way of taming them
At lvl 72 with flak armor on, a lvl 5 Troodon knocked me out with one attack at night. Last thing I saw was those glowing eyes before passing out. My Guess is that they attack vital organs. Luckily my Doedicarus was up for a game of baseball and launched that little devil out into the stands.