Troodons are deadly purely because of their poison. Be alone or in groups, they rarely deal any real damage when wild. But consider those facts about their poison:
1-It ignores armor: No matter the damage you receive, the effect of poison is applied to reach exact 50 points of torpor during the 10 seconds it last. The only way to not pass out after a Troodon bite is having at least a point of fortitude or using Stimulants.
2- It does not stack, but can be re-applied; When fighting groups, don't panick as they won'y knock you down any faster because of their numbers. If possible, kill them with headshots before fainting instead of running.
As always, consider bolting to a safe area with a flying or climbing mount after the poison shows its fangs.