There's a chance they may, so keep an eye on them.
Does the one poop you found in with your other boys look like the classic 'dog poop' image? lol.. I've had acouple of my boys do something that looked like that, which i think is normal.
Here's a link to another site with a thread about that:
As for acouple more showing up, they may be popping out because the salt is bothering them. If they are still there after his treatment then you can get him some Maracide and treat him with that. It's liquid and is for any external parasites and is awesome.