Freddy's publishes no ingredient lists, and the only time they have named their fryer oil was a 2023 post from their own X account describing a blend of soybean and high oleic soybean oil. That is three years old, so it is recorded at low confidence, and it covers only the fried items - nothing is published about the grill, the buns or the dressings.
Rated 2026-09-02 at low confidence, and the source matters. Freddy's own site publishes no ingredient statements at all - the nutrition page is an allergen matrix and the word "ingredient" appears twice, both boilerplate. The only place they have ever named their fryer oil is their own X account, @FreddysUSA, on 2023-05-22: "Our fryer oil is a new product which is a high-performance blend of soybean & high oleic soybean oil." That is first-party but it is over three years old and it says "a new product", which implies the formulation had already changed once. So it is scored at 0.5 confidence, not as a settled fact. It covers the fryer only - fries, chicken tenders, cheese curds and onion rings - so the answer is some rather than all; nothing is published about the flat-top fat, the buns or the dressings. Nova comes from their own blog: custard is "freshly churn[ed] throughout the day at each restaurant" and steakburgers are "cooked-to-order".