By potato chips, you are referring to the bucket-type potato chips you buy in supermarkets, which are Kartoffelchips, usually shortened to Chips. There are also Pommes-Chips in Switzerland.

For French fries, you can just say Pommes. Whether you order food (prepared) in a restaurant or buy semi-finished products in the supermarket (semi-finished products are frozen in the refrigerator, cut into pieces, and fried at home)

There is also a kind of Common snacks in Germany, Mexican nachos, Tortilla-Chip. Ordered one at the cinema and it was delicious with chili sauce.