I've always thought that the Barraki would wear masks that aren't necessarily in the canon, because I'm sure there are many masks, we just haven't seem them in the story.
I actually wrote down in a list somewhere what masks they wore, in my mind, at least, and if I remember, they were:
Pridak: Mask of Rage - makes the wearer stronger but causes uncontrollable anger
Carapar: Mask of Removal - allows the user to remove any non-vital body part (this goes along with him removing one of his claws in order to wield a Squid Launcher)
Kalmah: Mask of Regeneration - the user can regrow body parts; the speed at which the parts are recovered depends on the amount lost
Takadox: Mask of Deception - the user casts a "spell" on an item, rendering it invisible as long as the mask is active; can only be used on one object at a time, and the effect turns off when the mask is deactivated, but returns when the mask is used again (hence how he was able to hide his Transit Tablet or whatever it was called)
Mantax: Mask of Camouflage - the user can blend in with their surroundings, rendering them nearly invisible; requires the wearer to be pressed against the surface to work, and any shift in body will require the mask to be used again.