Hello and thank you for this design. Is it possible to use this type for a chidren french book ? How ? Could you answer me at chandelierestelle@yahoo.fr Thank you again.

Hickory Jack can be used for a book if you purchase a license. If a print book, you'll need a desktop license. If an ebook, an ebook license.

Both of these can be purchased on my website:
https://brittneymurphydesign.com/downloads/hickory-jack-font-family/