Wendy's fries ingredients:
Potatoes, Vegetable Oil (contains one or more of the following oils: canola, soybean, cottonseed, sunflower, corn), Dextrose, Sodium Acid Pyrophosphate (to maintain natural color). Cooked in Vegetable Oil (soybean oil, corn oil, cottonseed oil, hydrogenated soybean oil, natural flavor [vegetable]
, citric acid [preservative], dimethylpolysiloxane [anti-foaming agent]). Cooked in the same oil as menu items that contain Wheat, Egg, Milk, and Fish (where available). Seasoned with Sea Salt.
So, according to their website, Wendy's fries don't contain any beef flavoring.