Hard to prove a negative, but the answer is no. Here's some support:
By Jonathan Maberry
This is one of the oldest American martial arts legends, and there is
absolutely no basis or reality in it. First off, there is no
department or process within the U.S. government to regulate martial
arts, which means there is no instrument in place to identify persons
practicing fighting arts, and no governmental method by which
practitioners can be evaluated. ...
Actually there is not a country on earth where martial artists are
required to register themselves as weapons, deadly or otherwise.
This myth has its roots in two different aspects of mid-20th century
history. In post-World War II Japan traditional martial arts were made
illegal, and records were kept of those persons who were experienced
practitioners of the arts. This was a bit of anti-Japanese backlash
following the war and lasted only a few years. It has not been
repeated, and it never spread beyond the borders of Japan.
The other root is planted in the soil of the rich and often outrageous
history of professional boxing. In the Joe Lewis era (the boxer, not
the karate master), it was a common publicity stunt to have police on
hand during a press conference to “register” the boxer as a deadly
weapon. Understand, this was just a publicity stunt and carried no
more legal weight than receiving the Key to the City actually means
you can open any door with it and just walk in.
In court cases involving violent confrontations, lawyers and judges
may advise the jury to bear in mind a person’s martial arts, boxing,
or military combat training when evaluating the facts of the case. For
example, in the Matter of the Welfare of D.S.F., 416 N.W.2d 772 (Minn.
App. 1988), the Minnesota Court of Appeals concluded that the
defendant, who had "substantial experience in karate," was aware
enough of the potential of his blows to deliberately break the
plaintiff’s jaw. But that is a lot different from legally stating that
the person in question is a registered or licensed “deadly weapon”.