For slaying the giants and their pet, and surviving the cold night you each receive 4,000 experience points
In the filthy and ice encrusted sachels you find some dead, dismembered humanoid parts, boulders for throwing and:
880 gold pieces
23 platinum pieces
4 Deep blue spinels (500gp each)
a +1 dagger
a potion of bless
After some careful dissection Jaxx removes a strange gland from the remorhaz's body which glows with internal heat.