Dump fall sprinkles in a small bowl (I mixed two types of sprinkles together). Lay down wax paper in preparation for assembly of the acorns.

Melted Nutella or chocolate frosting in the microwave in a deep, small bowl about 15-20 seconds or until just melted. Dip each donut hole halfway into Nutella/frosting, then dip in sprinkles. Place a stick pretzel, broken in half, into the top of the "acorn" and let cool on wax paper.