Batata means potato, no distinction of which kind.
'Fries" is batata(s) frita(s), sometimes just "fritas".
There is no word in Portuguese for chips (not that I know). If they are potato chips, we call them "batata frita" as well, and we can use "chips" sometimes. "Chips de batata".
Other chips, like those yellow ones made from corn are called "salgadinho(s)" in general.