More gollens or "defensive mobs"

It would be nice if there were more mobs like the iron gollen that the player could place in their bases to protect themselves.

There's the snowman, but since it melts in warmer biomes and snowballs don't count damage, it's kind of useless.

It would be nice if we could create more of these friendly mobs. like the iron gollen, who attack all hostile mobs and defend their base.

One idea would be a "friendly skeleton", which attacks hostile mobs that approach with arrows.