One of the out of the box Tabs that can be added in Teams channels is the Forms Tab. This Tab allows to either create a form from scratch or add an existing one:
If we choose to create a new Form, we will need first to type the Form name and click on “Save”:
Once the Form is created, we can start with the design of the Form using the Forms designer:
As expected, from the Designer we can change the Form look & feel and also preview how it looks like before sharing with other users: