I think he should but i'm not sure.
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It's possible for him to be able to use haki, but he hasn't been confirmed as having it....yet.
Personally, I'm looking forward to the possibilities. Maybe he will be cutting diamonds in the future at some point after all.
As far as I know, and have seen anyone can use Haki. It's probably some kind of an inner-sleeping Power that when awaken can be used as a Weapon ( Take the Amazon's from Amazon Lily for example ) They can freely use their Haki as their will and they are also able to imbue their Haki into their Arrows.
"With a thrust it's a Spear; with a sweep it's a Naginata, when you hold it, it's a Longsword; a Cane can become each of those things!"-
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As i said, the second incident i have not found and cannot look for because i am already distracted enough by the internet, i can't go rereading all of One Piece(which i will) just to stimulate discussion on the internet. I have to study for the CFA exam in June.
NO he can not use it its never been stated and in both examples they backed away out of fear not haki
I'll stay with my theory, that he can use a sort of Mantra (like the people of Shandia) which is probably a variation of Haki.
look he is a bad A** people are scared of him that does not mean he has haki