Cub Scouts is based on The Jungle Book by Rudyard Kipling.
As they were written so long ago, they're now public domain (so we can show them here).
...by Rudyard Kipling:
The Jungle Book - The main focus of Cub Scouts is on the first story - Mowgli's Brothers
The Second Jungle Book
Kim - another book by Kipling, from which we get "Kim's Game" - a game of observation.
Just So Stories - A collection of other stories along similar lines.
In the Rukh - A story including Mowgli from The Jungle Book, as an adult - written before the Jungle Books.