Hi Glauce, I know what you mean. "Abacaxi" is used as a commom name for a few species of plecos here in Brasil, usualy Pterygoplichthys pardalis , or other species of Pterygoplichthys. But I have seen some Hypostomus being sold as Abacaxi as well.
I think I got the same fish as you.
Hypostomus ...

Hello guys, help me identify this pleco please. I would like to have it's id, mainly to know the adult size. He's growing fast, had overgrowth my l002 tiger pleco very quickly. People who saw the pics said it's an "abacaxi" "certainly", but I think they call a lot of the more common species sold in ...