Making this tomorrow for "cooking class"(giggle)! We'll make regular bread dough and shape it. Poppy seeds will serve as eyes.
My daughter shaped most of these today. There are snails, slugs, bear heads(as pictured above from original idea), and other shapes. Many were rolled in poppy seeds for spotted versions of the animals. I added extra oil to this recipe so that it would be easier to shape, and probably should have let it rise only once because it obscured the shapes, which I knew would happen to some extent. We'll do this again. It was fun even though my kitchen looks like a flour explosion.
Here's a student lesson at RedStarYeast.com on the science of yeast.