Nah, I don't think it's a south american puffer.
I haven't actually seen it, but the LFS has them in stock, so I should have a better report later today.
Peruvian puffer is an alternate common name for Colomesus asellus. Which, of course, has nothing to do with names attached by wholesalers and LFS. After all, what does Peru have to do with Souith America?