Dock - app name instead of icons?
I was curious about what you wanted, but you can't just have "Text" instead of icons, but you can have icons that are "text" :)

check out this link on how one user solved his issue.

http://arctictransfuse.deviantart.com/art/Gill-Sans-Text-Dock-Icons-154466636

the download link is over on the right side.

how to change your icons in OSX http://support.apple.com/kb/ht2493

i think this is what you were going after...