You could try using a large shield, like say the bone shield to practise, you can then block a lot of damage and see the 2 attacks the trolls (both types of troll) do, one is a swipe which is less damaging and the other is a smash which can insta kill early characters.

I tend to parry the none log using trolls, dodging the 2 handed smash and parrying the swipe... I tend to just burn the log user as that hit detection can be iffy to deal with.