These are tiny itty bitty snails you can't even see them, unless you look really, really closely. Looks like they are not dead. According to someone who is familiar with the snails got back with me and told me if the snails are still int their shell's they are not dead.
The snails didn't end up in the tank because I took the duckweed by hand to put them in my tank gently to they stay on the top. Anyways, so I have a few baby snails and one bigger one, I'll just put them in my tank so they can live of whatever algae there is in the tank.
No, my Betta's are doing good. I just did a 85% water change when I added the duckweed at the very last minute when I was done with their tanks. I will be posting some pictures of how their tanks look like now, their permanent homes.