A terrible way to tame but it works. Have it in a pen and raise baby brontos paracers rexes. Anything with a high enough level. Build ramps into the pen and lure the baby into it. Since babies only flee and can't fight it gives the bonus of the level and creature and tames the troodon quickly.
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.