After a lot of poking around in the game files for various reason I stumbled one day on another version of Rogash, dubbed Rogash_New, which happened to have a much higher resolution model than the current Rogash. The only inconvenient was that this model used the CAH troll animation (it was basically the CAH troll). Which where fine when the troll wield a hammer, club or tree trunk but I found unfitting of a "troll that fights like a trained swordsmen". So gathering my meager modelling experience I rigged the Rogash animation onto that troll.
My suggestion is to replace the current rogash model with the edited one. It's quite an improvement on the current rogash (in my opinion at least).
I'm not completely done with it, I just need to fix a couple clipping issues due to the bigger shoulder pads but apart from that I think the model looks good like that. It's just the Troll CAH's snow gear scaled up with Rogash's Animation. I'm not sure what method the Team would prefer to get the files, if they do want them, so if the Team is interested I can send the edited model.
Latest version of the edited model
Animations shown on an old version of the edited model.
https://www.youtube.com/watch?v=POy7Lh-DHIA