Piggybanks? I'm no psychic, but I've got the feeling that they contain something.
The Porkibank is a considerate companion and is always there when a Hoodlum needs him. In exchange for his services, the Hoodlums give him little gifts—In-game description, Rayman 3
Pigpots, also known as Piggybanks or Porkibanks, are destructible objects found in Rayman 3. They are very common and can be found in almost every level. They are pig-shaped and -sized wooden boxes with a few metal platings. They have drawn-on eyes and mouths, with wooden pig-ears pointing out of their head. They belong to the Hoodlums, who apparently created them. They are used by the Hoodlums to store gems and Red Lums. When Pigpots are first seen within the Fairy Council, Rayman must break them in order to magically open a door, prompting Murfy's sarcastic commentary on the contrived nature of the situation.
The previous design of the Pigpots.