The name of the CRE file is OBSICE01.CRE. This file refer to a snow troll from the planar sphere.
There are also other CRE files which are assigned to snow trolls (TROLSN01 AND TROLSN02), but i do not know which snow trolls these CRE files are refering to.
Inside the Planar Sphere, in the Ice Room is a snow troll which has been assigned standard troll animation. it would be great to change his apperance to snow troll animation.