This is a strange one, they are initially submerged in the soil and then break through and splits open. ( photo / image / picture from Kildale's Garden ) ( photo / image / picture from Kildale's Garden )
As I scrolled down to see your photographs at first glance the top one looked like a skull. I've seen puffballs do that and watched as the spores were ejected from them into the air.
Haven't had a lot of spring mushrooms this year. it has rained quite a lot and we didn't get out there.