No, the seeds are not edible, but apparently they yield and edible oil. There are 2 species of Crescentia, C. cujete has round fruits and C. alata with oval shapped fruits. There are also a rare variety or species in Equador that is edible!
I am so crazy than one time I bought one painted dried calabash of C. alata just to get the seeds, and I am so lucky thta most of them germinated LOL!!