Here you go:

type troll2
skeleton fs_troll
scale 1.90
indiv_range 40
texture dacia, data/stw/models_unit/textures/zunit_troll2.tga
model_flexi data/stw/models_unit/zunit_troll2.cas, 25
model_flexi data/stw/models_unit/zunit_troll2.cas, 40
model_flexi data/stw/models_unit/zunit_troll2.cas, 70
model_flexi data/stw/models_unit/zunit_troll2.cas, max
model_tri 400, 0.5f, 0.5f, 0.5f

The scale is set to the same as the skeleton.

I tried scaling up 3 different sword animations (Sig1, EB and vanilla) with the same result. I also tried it without the DMB scale line and the trolls appeared vaugely in proportion but human size (and still hovering off the ground).