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 Karl was born in 1927.
Frederick Stock was born in 1872.
Frederick Gore was born in 1913.
Frederick Montague was born on October 8, 1876.
Frederick I was born on May 8, 1460.
Frederick Victor was born in 1869.
Frederick Barry was born in 1953.
Michael Frederick was born in 1927.
Frederick Tweedie was born in 1877.
Frederick Bird was born in 1875.
Frederick Lablache was born in 1815.