I never heard about such a compound. If this exists, then it will be N3F4.
By the way, check if you did not mean Dinitrogen tetrafluoride, as I don't know about trinitrogen tetrafluoride.
The silicon tetrafluoride formula is SiF4.
Selenium tetrafluoride is SeF4
The chemical formula for sulfur tetrafluoride is SF4.
XeF4
The Correct Chemical Name is: xenon tetrafluoride
Sulfur Tetrafluoride
The formula for Phosphorus Trifluoride is PF3
SiF4
The Chemical Formula for carbon tetrafluoride is CF4.
Carbon tetrafluoride a.k.a. tetrafluoromethane.
Xenon tetrafluoride is XeF4
Its Si + 2F2 = SiF4