My 9 1/2 month old is refusing to eat baby food from a spoon???

This may sound a little silly but I'm not quite sure what to feed him. I have tried green beans, mac n cheese, the little turkey stick from gerber and he just smashes it and bangs it into the high chair (which is really cute but not nutritious). He will pick up banana, toast/bagel, and cheese but that is about it. At this age would he be able to gum chopped chicken for protein? Any suggestions on what to feed him at this age would be greatly appreciated. I just don't want to start feeding him junk full of sugar and crazy ingredients you can't pronounce! He is only in the 3rd percentile for his weight so I am a little worried that during this new stage of his life his weight gain will decrease even more. Please help! Thank you!