Minecraft wiki entry for Zombified_piglin_farming, associated text: To build a farm in the Overworld, one can build a lot of large nether portals, interlocked to save obsidian, and put signs or open trapdoors on the edges of the bottom obsidian blocks, so that zombified piglins (ZPs) will walk off. From here, one can use water to collect them into a fall or suffocation trap. Snow golems can be an alternative for pushing them around, or at least getting them moving.