If you go the shield route, get used to parrying - When you parry an attack it blocks a lot more of the damage and stuns the trolls, allowing you to do much more damage not only because they are stunned but it you do more damage with your weapon when they're in that state. The downside is you need to get used to blocking right at the last moment and if your timing is off you'll eat their attack.

You can also dodge-roll away from their attacks as well - as soon as they start swinging use roll to get away. Hold block, then jump in a direction and you'll roll away.

But bows are always good against trolls.