U can check if its a golem by using the spyglass. Once found the lucky 1 search for a hill. Put some pillars down in front of it and place a cannon on top of it. I would also recommend that u put down a bed behind the hill. Then u can kite it to the pillars where it will just get stuck and shoot at it (it has no headshot multipliers). U need the hill if its about to throw a rock at u since those will often 1 shot u. If its about to do that u just run to the other side of the hill and then keep shooting it. I would recommend to tame it with as much mantis kibble as u have and the rest sulfur (everything else takes far to long and even a low lvl golem still has a lot of hp)
It's a bit silly that kibble tames it a lot better than rocks or sulfur because even in the dossier it says that it lives off of absorbing nearby rocks and minerals. So mabey they should make it so you have to feed them a rare mineral like obsidian what if they made it so you could tame one fast and with high effectiveness by giving one a few hundred or few thousand obsidian . or what if there kibble was made out of a combination of ores and minerals .