Welcome to the Forum!
Don’t worry too much, hogs do tend to disappear from time to time, for all sorts of reasons. One of them is hibernation – some males do begin to hibernate as early as September. Normally the males disappear first, then the females and then hoglets – although some hoglets, in particular, decide not to hibernate at all.
Hopefully the hogs return, even if not until the Spring. The early hibernators can return as soon as March. I would continue to offer some food, despite the current absence of hogs (even if a bit less than usual), but especially leave water available all day every day, even through the winter. Sometimes late hoglets appear as if from nowhere and would probably welcome some food. Also the hogs might just be visiting other parts of their ranges and return soon.
Good luck – I hope all turns out well.