T.L.
My nephew will hold food in his cheek for 1/2 a day if you let him. He looks like a little squirel. He also doesn't eat on a regular basis. It got to the point that his doctor said to let him eat ice cream for every meal if he wanted too. However he is now 7 and is fine. Another weird thing he did was he never slept much. He would go to bed at 8:00 and lay there until 12 before falling asleep then be back up at 6:00 am ready to go. He never did naps well either he would just lay in bed never falling asleep.
If it doesn't bother him to hold the food in his mouth I would let him. Apparently it doesn't bother him to be there or to be soggy.