I found one that for one USB-C connection gave two USB3 and two USB-C ports. It worked, but caused issues with Bluetooth* on my Mac Mini. Thus I stopped using it. I still have in a closet somewhere, so I can look for the make and model if you'd like.
I recall seeing a pre-announcement of a Thunderbolt 4 doc that had four Thunderbolt ports. But I was not able to relocate it with a quick search.
Good luck and it you find one please let us know.
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* I believe this was the culprit in my Bluetooth issues, as when I removed it the issues went away. However, I also removed three old Firewire drives at the same time, so I am not positive this dock was the issue. Other than that I was not able to find such a dock.