Sorry... I just realized this. I liked the idea of a Jedi tree. Oh, well. Back to your drinks folks. Nothing to see here.
Oh my... My poor fellow, it sounds like you would benefit from there being a dedicated thread to better familiarise yourself with Duros. It could, like, contain examples of other Duros, such as the two in Chalmun's cantina, which you could compare with Ood Bnar to work out whether or not he's Duros. Do we have any existing threads like that?
Ood Bnar has a mouth. Trees don't have mouths. Duros have mouths. Ergo, Ood Bnar is more Duros than tree.
And there are two Duros who are also No More in Chalmun's Cantina in The Star Wars Holiday Special to compare him with.