Early game Log trolls are best to keep at bay with arrows as that log hits hard and range is longer, flint is better than fire and head shots count.

Early game Barehand trolls one on one can be taken out with melee. You can lock them in one spot just walking away and jogging back and forth from them juggling between their swipe attack and their double hand smash attack.

Example: swipe, walk back then jog in hit twice, walk back to miss next swipe attack.

then the double hand smash only activates every 5 or so swipes so be wary and start just waiting for that attack to be done before going in for more hits. Once the smash is done he will nearly immediately start a swipe so you might be able to get one hit in but it might be too close for your liking so either wait for the swipe to be over then proceed with meleeing in-between swipes