Make a copper golem in minecraft - how?

check your version before anything else. it came in with the copper update in 1.21.9, so on an older world or a server that hasn't updated the pumpkin just sits on the copper block and nothing happens. if yours already turned into a statue, scrape it with an axe and it comes back to life. wax it after that.

copper block down, carved pumpkin on top, pumpkin last. same build as a snow golem. the bit nobody warns you about is that it oxidises like the rest of your copper and once it's gone all the way it stops moving, so wax it with honeycomb early if you want it running.