Be careful when roaming during the night since these guys get a speed boost but if you do encounter one try to make sure your near a tamed Dino that can protect you since troodons can only tranq humans and not Dino's if you don't have any tames then make sure you got some stims
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.
I'm pretty sure none of the people writing these posts have ever tamed a Troodon. I say this because none of them have mentioned some of the awesome scouting skills of the creature. With that said, here's some things you should know. I tamed a level 15 a few minutes ago. To do it in one shot I fed it a level 100 crystal waveren on neutral. First I took the health down to about 50. Im on a pve server so I used a combination of jumping off cliffs and a nearby wild animal. Then I went to the troodon. And got it agroed attacking the wavren (had a buddy help). I watched the wavrens health until the last second and dismounted and the final bite and kill tamed the troodon. You cannot be sitting on the sacrifice and it must be in neutral. Just a bit before I attempted a level 55 troodon with a level 224 wavren with only a 88% tamed. Before I could get another wavren out of cryo to finish the tamed it lost all 88%. Good Luck!