I know of several Frohock's from Waldo Co., Maine. I've information of a Andrew Frohock from England. I've no dates for him. His son was Thomas born 1 Sept 1749, and no known sibblings. No known birth place for Thomas. Thomas had a son also named Thomas and born 26 July 1785, also no known sibblings. Thomas Frohock Jr. married a Mary Ray. They had 13 known children. Several of the children and grandchildren were born in Waldo Co. There was a Millard Maurice Frohock born in Linconville, Waldo Co.
One of the Thomas Frohock's might be either a uncle or great uncle of your Nancy Frohock.