This command will add custom eggs to your world. It's a WIP, so here are the things I want to get done:
1. Fix Iron Golem Spawn Egg or add new crafting recipe
2. Add Snow Golem and crafting
3. Add Wither Egg and crafting
For now, to spawn an iron golem with an egg, rename a normal wolf egg to Spawn-Iron-Golem (Capitals are important)
I used MrGaretto's Only One Command Generator to create this.