Can I have multiple prototypes in Figma?

Figma lets you have as many prototypes you want in one file without limitations. You don't need any plugins to do it.

Can I have multiple prototypes in Figma?

All you have to do is select your starting prototype wireframe, then go to prototype and create a new starting point by clicking the - icon. 

Once you created a new starting point you can just click on the play icon next to your wireframe to run your prototype. If you want to add another one just do the same thing but always select a prototype different from your first one's starting point.
You can only have one prototype starting point per wireframe. 

This means you cannot have two separate prototypes that start from the same landing page. You'll just have to duplicate your page and then start a new one. 

The other wireframes that link from one another can be combined on unlimited prototypes, it doesn't really affect your webflows.