"Everyone gather 'round," said Snape, his black eyes glittering, and watch what happens to Longbottom's toad. If he has managed to produce a Shrinking Solution, it will shrink to a tadpole. If, as I don't doubt, he has done it wrong, his toad is likely to be poisoned." (Harry Potter and the Prisoner of Azkaban)
It seems that the point of Shrinking Solution is to physically shrink the size of beings (similar but opposite to Swelling Solution that Harry exploded in Goyle's cauldron in The Chamber Of Secrets to let Hermione steal ingredients).
But a tadpole is not just a small frog - it's a young frog.
If the solution makes beings younger, shouldn't it be a rejuvenation solution and not Shrinking Solution?
Is there anything else in canon addressing this weirdness?