Frozen Milk Funny Taste

My frozen milk had an odd taste/smell when its thawed and my baby wont drink it unless its halved with fresh milk. Its not bad just tastes different than fresh. Im quitting pumping soon so i wont have the fresh to mix with it. Can i add something else to the milk so my baby will like it better? Maybe a tbsp of flavored rice or something? Please any suggestions you've used would help so much! I have over 2000 oz i dont want to go to waste!!