E.K.
I have no idea if my experience will help yours or not, but YES my daughter was a food tosser, hider, etc. She is 18 months and it IS a lot better. I did a few things, I have no idea what was most effective...
When the tossing starts, I would calmly say "no" or "we don't throw our food", or something. (They understand more that we tend to give them credit for, and even if they don't understand right away they will get the hang of it eventually if you do it). If it continues, I would either take the food out of her hand myself and/or turn my back to her for 15-30 seconds. The turning the back thing is sort of like a timeout, and I read that at that age it is a good way to discourage behavior that you don't like. And, I also only gave a little food at a time. She tended to get distracted by too much food on her tray and then just started playing with it.
If it continues more, you might consider taking her down from the chair and ending meal time. I found that very difficult to do, as tossing happened pretty early in the meal and I was always worried she hadn't eaten enough yet. BUT, that said, every book under the sun tells you to take them out of the chair and end the meal.
Good luck. It WILL end, this is just another FUN phase they go through!!! :-) (Oh, and, my favorite part of it was when I was down on the ground cleaning things up, getting a piece of food thrown on me! Now THAT is a degrading feeling!!!)
P.S. If you don't have a dog, a dustbuster can be a very helpful tool during this phase!