Are you sure they arent snails that might have hitchhiked in on a plant?
Nerite snails will still lay eggs in freshwater, they look like small white spots and get laid all over the aquarium glass, driftwood etc. You cant miss them. You never mentioned eggs, did you see that?
As you mention, its commonly said that nerite snail eggs will only hatch in brackish water, so if they have hatched in your freshwater set up that's unusual.
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Aiken Drum
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