switch – Is there a Thunderbolt 3 based Switcher?

My Context is, that I want to connect an external Graphic card to a thunderbolt 3 Dockingstation and now I want to be able to connect multiple devices to that docking station and be able to switch them.

I talk about the external graphic card because those need the 40 GP/S in order to properly work, at least according to my short googling.

Can somebody recommend a Thunderbolt 3 Switcher that can connect a Thunderbolt 3 Dockingstation with 2 or more Notebooks (or similar)?