This person appears to be Declan Mulholland, the stand-in from the deleted scene in which Jabba the Hutt was meant to appear:
Mulholland would have been replaced with a stop-motion creature during post-production had the scene not ended up on the cutting room floor. - source
The look for the stand-in was never canon; Jabba was never going to look like the that. Why does his face appear on the official Radio Drama cover if he was just standing-in for where Jabba was meant to appear?