You don't need FPGEE or Naplex for masters, however for residency programs both are required (as you have to be a licensed pharmacist to do so)
about transferring your pharmacy credit hours to dentistry. it is possible, but most likely they will transfer just few hours that they think is equivalent to their program, and i believe that would only apply to pre-dentistry. (like you would be able to get most of the pre-requisites with your pharmacy degree). there would still be a dentistry entry exam and around 4 yrs of dental school. (im not sure how long it is, but medicine is 4 yrs and i dont think dental is going to be more than that).
Good luck