That frog is CUTE!!! And funny, too. LOL! I don't know the technical term for it, but my machine made the bottom bobbin thread come up and show on top of the quilt, and you can't see the top spool thread at all.... it's not in nice, normal stitches on top. I'm using my regular "invisible" thread on top... it looks just like fishing line. I always use that stuff, and it usually works fine. I'm using the same 100% natural cotton batting as always. Same fabrics. So I don't know why it's misbehaving!!