I'm sorry to say but there are many many more than two species of freshwater puffer fish...
I wish the PufferPedia was working right now... but I know that there are atleast 12 species if not many more.
Some of the top of my head would be.. t. travancoricus (dwarf puffer) c. loreti, c. irrubesco, c. salvator (sp), mbu, fahaka,
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! DAnce, danCE, DANCe!