Ummmm...some kids seem to have hollow legs and can eat and eat! I just put a post up today about my little daycare monkeys eating me out of budget and playfelt came up with a few great ideas to maybe make bites a bit bigger and foods that they have to chew and take longer to eat. My friend's little guy seems to non stop eat and he is healthy and just has a fast metabolism. Might be the case with this little guy??
As for the nose thing, maybe an allergy? I know that a runny nose can also be linked to ear problems but to have ear problems this long without a Dr noticing it doesn't seem right
I would maybe suggest an allergy reaction and look into getting allergy testing done since they don't know his biological parents? A different suggestion that might get to the Doctor?