Potato chips: You mean the bottled potato chips bought in the supermarket, that is, Kartoffelchips, which are generally simplified as potato chips. There is also one in Switzerland called Pommes-Chips.

French fries can be called Pommes directly. Whether ordering food in a restaurant (cooked food) or buying semi-finished products in a supermarket (semi-finished products are frozen in the refrigerator and cut and fried at home)

There is also a common snack in Germany, cornflakes. It's nice to order one with Chili sauce in the cinema.