It Came From the Freezer
From the Super Mario Wiki
This level features Icicle Golem as a boss, and as such features an expansive area with many covers. Icicle Golem is initially the only enemy in this level, but during the second phase, Sherbet Smashers also appear. After one turn during Icicle Golem's third phase, Sherbet Supporters begin to appear on either side of him.