Hi JLP
Yes, I would definitely offer some food and water. It’s best to leave water available all day every day, including during the winter as you never know when a thirsty hog might turn up. Some people also leave food available all winter i.e. cat/kitten biscuits last a bit longer than some other foods.
There are several potential reasons – the hog may be one who has been hibernating and is just out and about to move nests, or maybe hadn’t put on enough fat to last the whole of hibernation in the first place, etc. (It may disappear again and potentially go back into hibernation). But it could also be a hog from elsewhere who decided not to hibernate and is now finding it isn’t getting enough food from its previous sources.
Whatever the reason, it may be hungry and thirsty and welcome some food and drink. It can always decline to eat it, if it chooses.
Good luck. I hope all goes well with the hog.