That’s really good news. I wouldn’t worry too much about them not eating the hog food, as long as they are eating the cat food (in one form or another!). Just annoying after you went to the trouble of getting it – our dear hog friends are not best known for their gratitude!
Good luck and I hope the youngsters continue to grow well. I still have two (rather large now) hoglets visiting nightly, as well as one venerable female – possibly not their Mum.