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I don't have much information on the Durgin's and have nothing on a Frederick. Have you obtained a birth certificate for your father?
The Durgins I have are from Cornish, Maine, where John Durgin was the earliest permanent settler in 1774. If you find that your ancestors go back to Maine, I would suggest that you get a copy of A History of the Town of Cornish, Maine, compiled by Ellis and Millard, Cornish Historical Society, 1994 (PO Box 79, Cornish, Maine 04020, $16). The book covers history from its first permanent settler (John Durgin) to 1916.