No. Channing Tatum did not appear in the 2001 movie Black Hawk Down. Maybe you are referring to Josh Hartnett, who looks just like Channing Tatum in this movie.
See full cast of the movie on IMDb.
Channing Tatum was born and raised in Alabama, appearing in front of the camera for the first time professionally as a fashion model. He began acting in 2004 with a role on CSI: Miami, and has since appeared in more than 20 films, including Havoc, Stop-Loss and Haywire. His recent projects include Foxcatcher (2014) and Magic Mike XXL (2015).
View Channing Tatum’s filmography on IMDb.
Find the latest news on Channing Tatum on Twitter @channingtatum or visit his Facebook page.