First, fold up and down until all overlap.
Second, after unfolding, the upper quarter is folded forward and the lower quarter is folded forward and upward.
Third, after the expansion, the following figure is shown.
4. The left and right folds are completely overlapped, as shown below.
5. Hold the upper right corner and the lower right corner of the paper and fold it forward to the middle.
6. After unfolding, hold the upper left corner and the lower left corner of the paper and fold it forward to the middle.
Seven, all spread out, all creases are two meters up and down, with a horizontal line in the middle.
Eight, pinch the two ends of the top horizontal line together, fold the rest along the crease, and flatten it into a double triangle.
In the same way, fold the lower part into a double triangle, and there are four corners at the left and right ends that can be turned up.
10. Fold the upper right corner forward to the middle and make a crease as shown in the figure below.
Eleven, the upper left corner is also folded forward to the center.
12. Fold the lower left corner and the lower right corner forward to the middle respectively.
13. Fold the upper left corner and the upper right corner forward and downward respectively.
14. Fold the lower left corner and the lower right corner forward and upward respectively.
Fifteen, turn to the other side.
16. Press the left corner and the right corner respectively, and center forward and downward.
17. Turn the triangle at the bottom up.
18. Insert the left and right corners into the adjacent gaps and flatten them.
19. Fold down as shown in the figure below.
Twenty, fold it again, and a lovely frog will be folded.