Snip the ends from 1 marshmallow to reveal the sticky insides, then snip the marshmallow in half crosswise so both sides are sticky. Pull each piece into an oval shape for the foot pads of the bunny. Press 1 small pink candy (such as Smarties) on the top of each foot pad, then stick 3 pink confetti sprinkles at the bottom of each. Use marshmallow fluff to stick the feet to the top of 1 plain cake doughnut. Dust the doughnut with confectioners' sugar, brushing off the feet so the pink is visible. Coat the top and sides of 1 marshmallow with marshmallow fluff using a butter knife, then roll in sweetened flaked coconut. Press the coconut to adhere. Stick the marshmallow in the hole of the doughnut, coconut-side up.
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