I was not aware that any species of hallucinogenic mushrooms can selectively distort your sense of size (ie. apart from the general distortion of all senses and perceptions with any hallucinogenic drug)
eating any kind of mushroom makes you larger, but only very slightly
Idk, there's a few with pretty strong laxative effects.
Yeah, you occasionally hear stories about people hurting themselves by trying to pole vault over a quarter or something because they thought it was the size of a fence. Or people being 'too small' to walk up the stairs.