I have wanted to try to make one of these ramp walker toys for a while. I was not confident that I would build one that works, not sure about the process that makes it walk. But I was able to make it walk "right out of the box". I did trim the swing leg a little with a chisel after assembly to make it work a little better. The pattern for this hedgehog came from the Spring 2021 issue of "Scroll Saw Woodworking & Crafts magazine", issue number 82. It also has an armadillo walker pattern.
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https://www.youtube.com/watch?v=KoFFPsEtMTs