I was making order in my old game magazines before, and I noticed in an issue they reviewed Mr.Nutz 2 for Megadrive (pal release).
Since we were discussing Mr.Nutz before, and noone mentioned an episode 2, I went to the always useful Genesis Collective, and the game was not listed. However, some comments in the Nutz page hinted at a sequel, so this review may not be a complete hoax.
So far my Google search has found very little evidence of Mr.Nutz 2. Maybe you'll have more luck.