The Adventures Of Old Mr. Toad in "The Little Toads Start Out To See The World"

So off he started, lipperty-lipperty-lip. He wondered if those pollywog children of Old Mr. Toad would be much changed. The last time he saw them some of them had just begun to grow legs, although they still had long tails.

He had almost reached the Smiling Pool when great big drops of rain began to splash down. And with those first raindrops something funny happened.