Hi Vater,
I appreciate your concern. I am aware that frogbit is restricted in some states. I have done research before making my post. Nothing states it's restricted in NC. I understand your concern about it getting into the wild and becoming invasive. I assure you that if it happens to fall out of my water garden somehow, it will die before it reaches any other water. I'm not located near any ponds, lakes, rivers, streams, or even any mud puddles as of late.
I'd honestly be happy with any kind of floating water plant except duckweed. I'm looking for something to help cover the surface of the water to help keep it from getting so warm and to combat algae. I'm mostly looking for Azolla, but anything else would be a plus as well. I have some other water plants for trade and perhaps some Drosera and pings. If those are a no-go, PM me and we can work something out.
Crystal