This block belongs to a popular quilt: Dear Jane. It’s block C09.
The template is a free PDF download from Susan Gatewood’s site.
How to do reverse appliqué with freezer paper
Susan’s Dear Jane templates are free though she says “I only ask that you consider making a donation to the Bennington Museum, in Bennington, Vermont. And if you do, it would make me tremendously happy if you would tell them that you have received help from me.” I totally recommend Susan’s patterns as they are very professional and easy to use.