Nubs is actually a member of a brand new species called Pooba. The Pooba were created specifically for “Star Wars: Young Jedi Adventures,” and they speak Poobian. Sadly, because the only Poobian we know is Nubs, that is pretty much everything we know about this species, other than that they are capable of using the Force and are blue and furry.
But if Nubs is no Ewok Jedi, then the question remains, can an Ewok be a Jedi in the first place? Well, the answer is complicated. There is an Ewok Jedi wielding a lightsaber and wearing Jedi robes seen in a picture inside a 2004 sourcebook for the “Star Wars Roleplaying Game.” This is part of the Legends universe, however, meaning it is not canon to the current continuity. Still, one is allowed to dream.
In the meantime, Nubs is one of the most cuddly and adorable little Jedi, so it’s hard to complain.