Use a trap to keep it in one location. Wait untill nightfall. Knock out your tame after setting it to nuetral and stand on it. The Troodon will hit it trying to attack you. To avoid getting knocked out, use a cheap Riot Shield. They bounce off.
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
The best hound dog.
This thing can sniff out tames players and traps For raids he is your #1 friend he can sniff out barried purlovias for the best hidden loot and can let you know whats inside and where the other players tames are so you can avoid killing them to stay hidden.
Use scorps. At most you will need like 11, to 15 around level 100-150. Scorpions don't need kibble, can be picked up with and argie. And best of all, they are easy knock out and tame. Since they only take spoiled meat. They are also pretty easy for a troodon to kill.
These Dino's eat your tamed Dino's. The more Dino's you sacrifice to him the more he gets tamed. Bigger and stronger ones give more taming progress because of the higher exp reward for killing it. Taming is based on how much xp worth of Dino's you fed to him. Stronger Dino's give more xp, therefore more taming progress. Also a tip is to lowerthe hp of the Dino's you are going to sacrifice to him to be sure not to kill it.
To tame egger troodons, find a low level, trap, and feed it high level female deer. It only takes 2-4 at night, shoot the deer til they're barely alive, put them on aggressive and punch them into the trap. Female deer can't hurt the troodon. Also they're 20 minute kibble tames with 13 or less dimorph kibble for a 150, so it's not a huge loss. I tamed 4 troodons this way, since I breed deer I had the females to spare.