High side switch with N-FET
Yes, you can use a NFET as a high side switch, with some aditional components.
To make this work, you need a bootstrap circuit. Basically what this circuit does is raises the Vgs of the NFET to meet the required turn-on voltage for the MOSFET. You can either build one, or search for a MOSFET driver that will drive a NFET on the Highside.
That said, if all you're doing is turning on an LED, then it would make more sense to use a PFET. You would only want to drive a NFET on the Highside if you couldn't/didn't want to use a PFET because the Rds value of it was too high for your application (i.e. 75 mOhms vs 12 mOhms).