weird rock

Complete and absolute newbie trying to figure out what I'm even looking at. I think the 1st one has them and sure the others don't, but included them hoping somebody knew what they are. The one that's colored and shaped like a peanut has a line that runs all the way around, like where a peanut...

So it doesn’t have any metal in it. It was just in a hole I dug for something else. It looked odd so I grabbed it. I thought it was a rock. But doesn’t seem strong enough for it to be one. Chunks can break off with enough pressure from my fingers. So I have no idea what this thing is. Did I find...