Another thing that bugs me about the slide of search engines is I still can't find info on the 2-3 books I've been searching for from my youth. I know they exist, but no keywords seem to work together meaningfully. My only touchstone would be my friend from grade school, but that time is long past.
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All of these would be published pre-90s probably pre-87
#1 - A kid who is into monster models, posters, and movies summons monsters into reality. I think he befriends the Frankenstein monster. There is a wisecracking blob.