Absolutely. It is pictured in numerous medieval and modern fencing treatises (though double dagger is less common).

http://www.alliancemartialarts.com/Solthurner-7a.JPG

http://i.ytimg.com/vi/CD0EbGpemLk/hqdefault.jpg

http://www.thehaca.com/pdf/sf15.JPG

The grip offers generally stronger downward thrusts and hooking capability.

For great discussions see these videos below from HEMA instructor Matt Easton from Scholagladiatora: https://www.youtube.com/watch?v=bRB9h8D3xao https://www.youtube.com/watch?v=CD0EbGpemLk