How to help baby pick up his food?

So I have been working in my sons ability to grasp on bite size foods so he can learn to feed himself, he does great with rice husks (the flavored baby rice biscuits), and holds them and eats them, but if I put puffs or anything bite sized on his tray, he just flicks it around with his fingers or plays with it. I have tried helping him and showing him how to grab it, I feel like he doesn't know it's food if it's not big enough to hold with his whole hand. I hope I'm not the only mom struggling with this feeding problem lol just need some advice maybe?