Mallet

Most woodworkers prefer a wooden mallet for striking chisels. The angled faces on this one (top picture) facilitate the proper strike angle between the forearm and the chisel. This is a mallet Norm has used in later episodes.

However, there are also many occasions when a little persuasion might be needed to facilitate mating of project pieces. One doesn't wish to mar the parts, so while Norm often uses a dead blow for that purpose, he frequently uses a wooden mallet as well. Examples center and below are representative of one he used in earlier episodes.

There is a better than even chance that Norm (or even Russell) made the one in the earlier episodes.