You can eat fly agaric, but you have to boil it, change the water, and repeat a couple of times. The egg could be meant to represent a puffball, young stinkhorn (either of which people do eat) or an amanita still in the volva (v dangerous!). Tree nose looks like birch polypore. Purple could be based on amethyst deceiver. NSFW is stinkhorn. Deeply disconcerting is likely mealy tooth, though iirc there may be another one that looks similar. Citadel is possibly one of the yellow coral fungi (there's a lot).