Note that two white tips are showing, and that there are 5 layers on the left side, and 3 layers on the right side. Book fold one layer to the right. Note that NO white tips are showing, and that there are 4 layers on each side. Fold the tip back down. Repeat Steps 19-20 on the other three sides.
Book fold as necessary.
The finished frog base. The frog base is used in the traditional frog and 4-petalled flower. A traditional base. Diagrammed by Jasper in 1999. Your comments are welcomed.