The invention relates to a method, an apparatus and a product making it possible to work with block-frozen raw materials in a smaller format in various ways in the fields of the bait and the fodder industries, more particularly in the fields of bait, where the method consists of making the block-frozen raw material smaller by the raw material being shredded, scraped or planed down to rather small shreds or flakes of various fine consistencies in a freezer cabin at a common storage freezing temperature in such a way, that the temperature of the frozen small shreds or flakes does not increase considerable during the execution of the method. The method is executed both by using manual shredders of various types or by using a special apparatus intended and invented for the said use, where the hardened edges of the plane teeth of the apparatus have nicks such that the edges are "teethed" with different locations of the nicks such that two and two plane teeth being identical and located crosswise from each other on the disk.