We cannot equip them, therefore we cannot learn them ourselves.
Though I would have hoped that the felguard would draw upon any eligible weapons from the wardrobe collection.
I suspect blizzard have not thought of that, or do not deem it important enough.
Warsmith Sigfinna in Brunnhildar Village in Icecrown.
http://www.wowhead.com/npc=30006/war...sigfinna#sells
No items currently equippable by warlock which I created, most likely will create warrior to test those.
Though I am not sure how they would be bound to the character to make them eligible.