Note: Malaysian trumpet snails do not make good food for puffer fish. Besides dwarf puffers, all species use their teeth to crack snail shells and many aquarists have reported the exceptionally hard and thick shell of the trumpet snail causing their puffer’s teeth to break. This can leave the puffer unable to eat.
Pea puffers don't bite the shell, they sort of suck the snail out of it, so it's ok if you want to get them. However, if you want to establish a colony of snails for puffer food, bladder snails do the trick well.