technically, yes.................
ethically and in compliance w the T&Cs you agreed to, no

so, be advised that per your own risk that:
12. In the case of fraud or abuse involving the Rewards Program, Point credit, Miles credit, Reward use, or a participating hotel, the Company and its travel partners have the right to take appropriate administrative and/or legal action, including but not limited to revocation/cancellation of any Reward and/or termination of Rewards Program Membership, and all Miles or Points and certificates (“Certificates”) earned through the Rewards Program may be forfeited and any relevant Membership Account(s) closed.
https://www.marriott.com/rewards/terms/default.mi

but then again, some folks in Southern California brag about doing exactly what you're asking to do.............. and in your part of the world do the FD agents not check the ID of the person checking in vrs the name on the reservation (cause they sure do here)?