Is there a bus from Shaolin to Yuntaishan?

No, there is no direct bus transferring you from Shaolin Temple to Yuntai Mountain.

You are advised to take the bus from Shaolin Temple to Dengfeng Bus Station and then take the bus in Dengfeng Bus Station to Jiaozuo Bus Station. Finally take the bus in Jiaozuo Bus Station to Yuntai Mountain scenic area.