In this datapack, you can spawn some mobs like you spawn golems.

Spawns (place a pumpkin on top of each):
Creepers can be spawned with two leaves (any kind, can be mixed)
Skeletons can be spawned with 2 bone blocks
Wither skeletons can be spawned with one bone block and a coal block (any order)
Strays can be spawned with one bone block and a snow block (any order)
Blazes can be spawned with two magma blocks
Endermen can be spawned with two chorus plants
Wardens can be spawned with 4 sculk in a T shape

Currently you can not build them sideways or upside down.

You can spawn friendly mobs by doing /team join playerfriendly @s
This will only make them friendly to players who can do the same.
You can make new players automatically able to spawn friendly mobs by doing /scoreboard players set golemfriendly default 1
This feature may not be compatible with other datapacks that use teams, but could be configured to do so, depending on how it uses teams.