No. At the time of the birth of his children, Frederick Douglass was living in a free state, so his children were not born into slavery. With the help of British supporters, Frederick Douglass was able to purchase his freedom in 1847.
Frederick Stock was born in 1872.
Frederick Karl was born in 1927.
Frederick Gore was born in 1913.
Frederick Montague was born on October 8, 1876.
Frederick Santall was born in 1903.
Frederick Busch was born in 1941.
Frederick Gunton was born in 1813.
Frederick Juengling was born in 1846.
Frederick Rowbottom was born in 1938.
Francis Frederick was born in 1907.
Frederick Bagemihl was born in 1920.