Bibubble

Bibubbles are small fluffy creatures accidently created by Phineas and Ferb in the upcoming episode, Troubles with Bibubbles. Not much is known about them, except they accidently make one and feed it too much, causing it to multiply and take over Danville when they all eat Linda's dinner.

Trivia

 * They are based off of a Star Trek creature, Tribbles.
 * Their episode, Troubles with Bibubbles, is also based off of the Tribbles' first appearance: The Trouble with Tribbles.