Waddle Doo are common enemies in the Kirby series. They are cycloptic, variants of Waddle Deethat fire energy whips from their eye to attack. If Kirby inhales one, he gets the Beam ability.
Aside from that they have the same behaviors as a Waddle Dee. Sometimes like a Waddle Deethey can be seen floating down from the sky with a parasol and if Kirby eats one with a parasol, he will get the Parasol ability instead of Beam.