It's an interesting background development that happened.
Trolka and Trolkin are split from the race of Trolls that roamed Valon in the Darke Ages. With the annulment of magic and Morgana's flight from the peacock throne, many races simply died off due to their reliance on wylde magick.
Trolls however, split into 2 races. Each race shows some, but not all of their character traits and flaws.
Rarest of the two are the Trolka, the larger troll-beings from Skandavia (Sweden). They can survive bitter cold, and incredibly strong and incredibly large. They can take a lot of damage, but do not hold any mineral properties like the Trolkin. Only in death do they become stone. It is said there are wild trolka too.
Trolkin are a smaller and more common race of troll-beings from Frozlande and more importantly Copendaz (Norway, Denmark) and some even live in Skandavia. They have stone-like skin of varying hues. Some have the ability to change colour to fit in with the rocky landscape (I like to think of Trolkin as being able to change to browns, mossy greens and greys). They have regenerative capabilities and can even grow back limbs. On rare occassion, a trolkin has been cut in two, only to find one half sprouting small legs and the other a small torso and head!
Both are slow, sluggish beings with very little of their own actual war-lust. They will join in a fight, enjoy it and eventually get bored. Trolka have joined in the fight on their own accord, the trolkin have been pretty much forced into it because of their hatred towards the Albion Orcs. They are supplied with Dwarf Weapons and clothing that reflects the fact they are fighting someone elses war! It barely fits their gangly, mishapen bodies!!!
You are not alone in your want for Flintloque Trolls. It's hard to say what an actual troll looks like, but I imagine a Scandinavian style troll, like those depicted by Arthur Rackham. Big noses, incredibly hunched over and quite a lot of hair...