Printscreen Lumia 920

Nope, but you can use the power button + home button at the same time. Would probably do too many Screenshots with it being touch related.
 
it is .. I wonder if doing that I could take a print with these buttons pressed with your finger over the screen
 
it is .. I wonder if doing that I could take a print with these buttons pressed with your finger over the screen
It is obvious why you are asking this, but I will give you the answer anyways.. but I shouldn't.

No, you can't. That's the reason why 6snap asks you to keep pressing the screen to see the pictures. So you can't take screenshots while you see them.