Mob Rebirth is a mod that makes it so when mobs die, there is a chance that it will be 'reborn'. What exactly this means is up to how you configure it.
You can set defaults for these, and for each mob, you can customize:
This mod can be run as server-side only, or installed on clients for singleplayer use.
Forge:
Requires Annotated DI (Forge) and Fireplace Lib (Forge)
Fabric:
Requires Fireplace Lib
I recommend using Mod Menu to configure this on the client because that's where the Config GUI is, but it is not required.
To report issues or request new features, use the issue tracker. Do not ask me to port to different Minecraft versions. For questions and other discussion, feel free to join my Discord.