Reegesk is essentially a rat wearing a hooded robe.  He is visible in the Cantina reacting to the murder of Greedo.  He is seated between a Jawa and Takeel.  This would suggest that he is at the table near the entrance where Takeel has previously been seen with Debnoli.  A few frames later, this table is shown again with Takeel and Mosep.  It’s possible that Reegesk is obscured in that shot.

Reegesk is certainly an example of an alien that Hasbro has never done, but I can see why they might shy away from him.  While some of the Cantina folks resemble Earth animals, this guy might be too obvious.  He feels too much like a low-budget 70’s Sci-Fi alien.  Now, if he’s on a vintage card and given the name Rat Face, I could see some kitsch appeal.