Here in NW Florida they look like a breast, in shape and coloration. The edges are creamy white, and darkening to the tip like a nipple. And when the cap pops, there is a little purple ring on the stem. Plus they always grow in grain fed cow or horse shit. There are ones that look like them, but they grow in dirt.
Kind of like these i found on Google.
No idea what kind you have in your neck of the woods.