- You may be looking for chips, or "fries".
Crisps, known as chips in the United States, (TV: Dead of Night) were, according to the Eighth Doctor, a "highly salted" and "processed" potato snack. Typically, they came in packets. The Doctor once used a packet of crisps to feed the Nukaryote, and thereby escaped being absorbed by it. (COMIC: Doctor Who and the Nightmare Game)
Later, when the Eleventh Doctor first met twelve-year-old Kazran Sardick, he initially suggested that they should spend Christmas Eve "eat[ing] crisps and talk[ing] about girls". (TV: A Christmas Carol)
The Twelfth Doctor was eating a bag of crisps when supervising Missy's adventure with Bill Potts and Nardole; he sheepishly denied it when the sound was heard over their communication system. (TV: World Enough and Time)