I killed trolls with just rags and a lvl 1 crude bow with wood arrows. And NO dodge rolling. Just running. The trick is to eat all stamina food. Berries, honey especially. Then mushrooms, which will give you more stamina then meat, but less health.

Now you can dash around like mad and kite him across the map. I actually prefer to do it in the forest, because he has to go around trees, so I can happily plink away at him from a distance.

Watch your stamina meter, don't let it run out, when the troll is directly behind you! They have long steps and catch up to you quickly. So try to evade him, watch that stamina bar and stick him with arrows.