I thought of that as a possibility but it doesn't make sense. The Cornish word for pig is indeed hogh, pl. hoghes so we only have a narrow similarity with the word "hoggan", and anyway the dialect word is "oggy" or "oggin".  The second point, I may be wrong on this, but I certainly never have heard of or eaten ) a pork pasty. Variants on traditional pasties include lamb/mutton, fish, or no meat and just potato, swede and onion but not pork. I found a recipe for a Pork and Apple pasty at http://www.properpasty.co.uk/products.html but I doubt that this is a traditional recipe. Pastied were the food of poorer people and usually had little meat in them at all, why then the pork connection?