You would use the info exactly as it is on the package of frozen fries. In the US the nutrition has to be for the item in the as is state. It's why macaroni and cheese has columns for as packaged and as prepared (with a little asterisk indicating what it is prepared with) and popcorn shows unpopped. Measure the fries frozen and track that because the info on the package does not include the oil that you cook them in (unless there is a separate column, but fries usually have baking instructions as well).
-google first. ask questions later.