Quote Originally Posted by pamipatch View Post
Usually used for appliqué, but it sounds like the pattern uses it as a foundation for string piecing.
I agree with pamipatch.

Freezer paper appliqué.
How to Freezer Paper Applique with Jan Patek - YouTube

Foundation piecing (just insert freezer paper where she uses the M* paper)
Quilting with scraps - Foundation Piecing to make the String Quilt! - YouTube