I know that regular sweet potato is but what about when they become fries
these are the ones that I eat https://www.ocado.com/webshop/product/McCain-Crispy-Sweet-Potato-Fries/293871011?from=order¶m=3913617826&parentContainer=ORDER%7C3913617826
They're still complex carbs. Depending on how they have been frozen they might have more fat though (I notice it says crispy coating so not sure what the nutritional info is?).
If you want to be sure of your sweet potato fries you can always just make your own anyway :-D