Following on from the previous two posts, if you unfold your frog base so that it’s back to a flat square, you will see that the crease pattern looks something like this:
Now what if we want to make a more complicated frog, perhaps with fingers and toes? We need extra paper! To get the full description, you need to read it in Robert J Lang’s book Origami Design Secrets, but suffice it to say, we can graft extra paper into the base as follows:
You can fold a frog as usual from the separated components of the frog base, and use the extra paper for fingers and toes. As a happy accident, the grafts also add paper at the head of the model, which we can use to model eyes.
The full instructions are in Origami Design Secrets as mentioned above.