Update 1.6.9, you may need to clear cache for updated files.
Minecraft 1.20.5 has changed syntax on many commands, so most commands will no longer work without an update.
An update is in progress, you can check compatibility progress here.
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Try the Commands Troubleshooting and Help page if you get stuff with server errors.
Minecraft Snow Golem NBT Data Tags
Using the summon command to spawn in a minecraft snow golem is simple, take the command and enter into chat and presto you have an snow golem.
How summon a Snow Golem without pumpkin head
To spawn in a snow golem without a pumpkin for a head just requires the nbt Pumpkin to be set to zero. This will summon a golem with no pumpkinhead.
/summon minecraft:snow_golem ~ ~ ~ {Pumpkin:0}
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If you're looking for a particular summon mob generator you can link to these specific versions of the command generator.