First, the day spawn is a little bit too small. It usually spawns 1 troll in front of you with a few more at the river crossing in the area's center. I think the chance to spawn at least 2 could be slightly increased. The night spawn is good, it usually spawn 2-3 trolls and even more at the river crossing.
In the troll cave there is always at least 1 yellow Fell Troll which is cool. Apart from that it spawns usually 1-2 trolls.
The monsters themselves are good. They don't deal huge amounts of damage or cast annoying spells but have lots of HP, regeneration and of course need to be finished with fire or acid. And they reward you with a decent amount of XP, for a 20 lvl characeter.
What's underwhelming however in both areas is the loot. There is literally 1 bones type treasure in the exterior area and 2-3 closed chests in the cave. And the loot they spawn is like this:


Loot from enemies is great as well:

Just what the....? I could go to Cloudpeak Foothills, which is a much smaller area, and loot 2 corpse type treasures, a locked chest and get much better loot or more gold. This just needs to be improved :/
That's my take on it, thanks for getting to the end.