can you eat Frost bitten beef
Technically, you can. The texture and flavor may have changed. Frostbitten food is food that has dehydrated in the freezer when frozen water molecules migrate. More here: http://www.chow.com/food-news/54260/what-is-freezer-burn/
You can eat beef that has freezer burn. It is safe to eat but will not taste very good. You can try to cut away the part that is freezer burnt but it usually doesn't help with the flavor.
Yes, you can eat it but like @CHOW said the flavor and the tenderness of the meat is not going to be any good.