This will depend on the brand and type of waffle fry that you buy. Seasoned fries are more likely to contain gluten but you will need to check the bag for a label that says “gluten free” or confirm by reading the added ingredients that no gluten or wheat has been added. If you’re in the US the bag is required to say “contains gluten” if there is any inside. A good brand for GF fries is Ore-Ida but make sure to check labels first.