Also, here's some more stylized rocks! The project includes quite an extensive master material that lets you tweak these assets quite a bit. LODs & Collisions are also setup but you may need to further tweak those depending on your usage. Those assets are quite low poly (~5k triangles for the biggest rock), so not that great for close up but they might be useful still :shrug:
Source files (Zbrush, Blender & Substance) : https://drive.google.com/file/d/1AQKwcpHcE-Wl_R4EQIfOChfgyVX-IWcn/view?usp=sharing
Enjoy!