can anyone list freshwater puffers? Question

can anyone help? im looking at getting a puffer but i dont know of any freshwater and what there compatability and requirements are like

 

I recently got a dwarf puffer fish (AKA pea puffer). They are 100% freshwater and can be kept in a tank as small as 5 gallons.
They are neet little fish, I love to watch him while I'm at my desk.
For more info on dwarf puffer fish check out Dwarfpuffers.com

 

cheers, are there any others that you know of?

 

I believe those are the only fw puffer available in the aquarium trade.