Sleep Pig Poppo
From the Super Mario Wiki, the Mario encyclopedia
They are generally harmless, since they only sleep. Running into or jumping onto one results in Donkey Kong being bounced back. A Sleep Pig Poppo can be attacked by using the Sound Wave Attack, causing it to flip over, dazed. It can then be punched until defeated (generally fifteen punches), causing it to "explode". They leave behind five beats.
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