Potatoes produce the highest level of satiety compared to other carbs. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6267283/ Combined with fats via frying or baking, and it's not a joke that they would make you feel the most full compared to a similar amount of rice or refined wheat bread/pasta.

A slightly healthier but equally delicious replacement for fries are oven-roasted or grilled duck fat potatoes with the skin on.