Virtually nothing is known about Fred Vokoun other that the bare facts given in the original sheet music of his only know work Santa Claus and there are very few of those indeed. That Fred Vokoun was a real name and not a pseudonym can be deduced from the fact the this piece, was dedicated to a certain "Wm. J. Schwarz of Boston, Mass. (A Prince of Good fellows)". The fact that his publisher, the Sam Fox Publishing Company, was located in Cleveland some 25 degrees of longitude to the west of Boston gives no clue to Vokoun's abode. He is not mentioned in any musical reference work and Internet research has revealed nothing.
For data housekeeping purposes he is listed in these webpages as a one-off composer.