Not exactly seen as such, but allow me to plunder my Realm of Chaos Gifts and Mutations charts to give you some “canonical” examples which might spark your imagination?
I’ll include their D1000 results for fun and flavour.
D061-075
Beweaponed Extremities. Arms and or legs have been replaced with blades or mace like appendages
D321-335
Horns. You’ve got Horns, you can gore opponents
D366-380
Iron Hard Skin
D501-515
Mechanoid. Your Kryten now. No not really. Many of the mutants in the unit have one or more mechanical parts substituted for their natural limbs and organs which are bonded to their living flesh. Tracks or wheels replace legs, arms become great pumping pistons, torsos are sheathed in metallic skins.
D531-545
Metal Body.
D696-710
Razor Sharp Claws
All entirely legitimate possibly mutations from Chaos’ earliest and arguably most fun days