"Harry's mouth fell open. The dishes in front of him were now piled with food. He had never seen so many things he liked to eat on one table: roast beef, roast chicken, pork chops and lamb chops, sausages, bacon and steak, boiled potatoes, roast potatoes, chips, Yorkshire pudding, peas, carrots, gravy, ketchup, and, for some strange reason, peppermint humbugs."
In the U.S., chips are referred to as "fries" or "French fries". These are about half to a quarter the thickness of British-style chips; those are referred to in the US as "steakhouse fries" or "steak fries". "Chips" is the US name for what the British call "crisps".
In the U.K., however, fries refer to US-style "French fries".