He is called “William ffoss formerly of Nichawannock, now of Portsmouth”83
William Frost bought forty acres of James Stackpole in what is now Rollinsford, in 1714, and sold the same to Benjamin Hoeg 2 October 1721. This was perhaps the one who married Elizabeth Snell. He returned from Portsmouth to Dover and, 13 December 1741, William and Elizabeth Frost, his wife, of Dover, sold to Giles Seward half of a house with small piece of land in Portsmouth. In these deeds the name is written fforst and Frost. The estate of William Frost of dover was appraised 29 June 1764, and William Frost was administrator. He is called Frost in the inventory and Foss in the administration.83