What kind of shrimp are these?

This was a bit of a challenge. I'm going to hazard a guess that they are some kind of ghost shrimp (Palaemonetes spp). They almost look like sulawesi shrimps or some other kind of ornamental shrimp, but if you bought them for cheap, they aren't likely ornamental shrimp. Those typically run $1+ for a single shrimp.

I doubt amanos would have been that cheap. They don't breed in freshwater and area all wild-caught.