Color changes in figurative origami models are almost always achieved by folding over paper at a corner or edge to reveal a secondary shade. The idea for this model was to break away from that tradition. I would do something uncommon. I would create white wings for the frog: small flaps at the center of the model, that poke out of the seam where the edges of the square meet. This creates a color change that is not from the edge of the paper. Unfortunately, this model was not well received, and while I am rather fond of it, I also believe that it cannot be viewed from any angle other than the one pictured below without becoming less endearing.

As a side note, while the structure was intended to be a hybrid base, the 22.5 degree lines at the head did not quite align with the grid of the 45 degree boxpleating. Therefore, I had to mush a bit at the transition to get the model to lie flat. If I ever make a redesign, that will be the first thing I fix.

Edit (5/17/25): So, I took the time to draw the crease pattern in Oriedita and the transition is actually not that bad at all! The misalignment is still so small that one could easily brute-force it without any negative impact on the final result.