What is the term used for the version of fries that is a smaller serving available late night?

The term for the smaller serving of fries that is available late at night is "Half fries." This option accurately captures the idea that the portion size is reduced compared to the standard serving of fries, catering to customers looking for a lighter snack during late-night hours.

In contrast, "Regular fries" would refer to the standard serving size without any reduction. "Double fries" implies an increased portion, which does not align with the concept of a smaller serving. "Curly fries" is a different style of fries altogether and does not denote a size; instead, it refers to the spiral-cut fry variety. Thus, "Half fries" is the appropriate choice for indicating a smaller serving offered at night.