I also don't know if you should throw blue ghost in there just yet. As far as I know, it hasn't been proven. Coulda been just a sweet fluke.
But hypo is the correct term for the "ghost" morphs we ball people have. In other snake circles a ghost means a snake that is both hypo and axanthic. The ball community seemed to just bully the rules out of the way and made ghost the term for hypos. I hope that's not too confusing.