Minecraft wiki entry for Tadpole, associated text: Entity data
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Tags common to all mobs[show]
 Age: Represents the age of the tadpole in ticks. When greater than or equal to 24000 game ticks (20 minutes), the tadpole grows up to a frog.
 FromBucket: 1 or 0 (true/false) - Whether the tadpole had ever been released from a bucket.