This is another project from summer camp. I used Crayola air-dry clay, which I don't recommend for longevity because the clay took a long time to dry in the humidity of summer and when it finally did it was still softer and more fragile than I would have liked. If you have a kiln, by all means use firing clay instead.
The eventually dried frogs were then painted with acrylic and glazed with acrylic gloss medium to get a nice seal and sheen. The kids had lots of reference images of tropical rain forest frogs to look at when sculpting their own frogs. Overall the results were adorable!
Here are some fabulous frogs:
This lesson would integrate well with a science rain forest unit. You could also introduce patterns if you wanted to. And if clay isn't in your budget, you could easily make these from paper-mache.