Which of these sides is known simply as 'tots' and can be found during late night hours?

The term 'tots' refers specifically to tater tots, which are small, cylindrical pieces of grated potatoes that are deep-fried until crispy. These are a popular side item often enjoyed as a snack or accompaniment to meals, particularly in casual fast-food settings. At many fast-food chains like Jack in the Box, tater tots are available during late-night hours, making them a convenient option for late-night dining.

The other items mentioned do not share this specific identity. Loaded potato wedges are typically larger and come with toppings; sweet potato fries offer a different flavor profile and texture; and onion rings are a completely different fried side. Therefore, the identification of tater tots as simply 'tots' aligns with their recognition and availability, particularly highlighting their presence during late-night hours at Jack in the Box.