You can, using a a thermal laminate board, but I'd plump for traditional cavity wall construction if I was more than 50% sure that I would be converting the garage in the near future. Hollow blockwork is fine, as far as it goes, but it is a cheaper form of construction, one which is finding it harder and harder to comply with improved building regulations. Also if you are going to be putting up a lot of shelves etc in a garage I'd prefer to be using fixings in a 100mm solid concrete block as opposed to the relatively thin hollow block.