Send them to me? As for adding a green spotted puffer, BAD idea! They need lots of room and will likely kill your fish along with the snails. And you would have to get more snails later to feed it. Also it's a brackish species. But boy would my puffers love those snails.
Pick them out or add a couple assassin snails. Keeping the tank super clean can also help keep their numbers down, as many snails won't breed as much if there isn't much food for them. No algae or excess fish food means little food for the snails.