New Super Luigi U: Frosted Glacier-2 -- Cooligan Shrooms

There are many Cooligans sliding around the level, which has tilting mushrooms for platforms. The first Star Coin is over the gap between two mushrooms. Between two pipes that send out infinite Cooligans is the second Star Coin under a nearby mushroom. The third Star Coin is over a patch of Nippers. Freeze a Cooligan that comes out of a pipe and stand on top of it as it glides over the Nippers. The flagpole is nearby.