I thawed frozen ground beef in the refrigerator over night. I took it out the next afternoon and made spaghetti sauce with it. The ground beef had a frozen like flavor to it. No mold or discoloration appeared but just a weird frozen like flavor. What can I do the next time to take away that old frozen flavor? 
"Frozen-like flavor" makes me think it may not have been properly wrapped/sealed and collected stray flavors from the freezer, and/or managed to get freezer-burned.   I don't know of any way that will "fix" that if it's already happened - prevention is the key. You can try using it only in highly-spiced dishes, if you like highly spiced dishes at all, but it does not really fix it, it just masks it somewhat. 