Some hogs choose not to hibernate. I still have one here. She didn’t hibernate last year either, although she was a hoglet then, but heavy enough. I wold keep leaving food out as long as there are any hogs about. Water should be left out all day every day even through the winter, whether you know hogs are around or not, in case a hog comes out of hibernation and is thirsty. In many places, they may not be able to find water otherwise, whereas there may be a small amount of natural food around and their fat reserves should help them to tick over for a short while – until you notice they are there and offer some food.
The hogs might still hibernate, yet. Some hibernate surprisingly late in the year.
Good luck with them.