define what is meant by "Maggot"
while I would generaly say "NO" for many reasons...
here is the thing; a "Maggot" is a larval stage of the development of an insect. based on that some larval insects are very good food for a reptile; example silk worms and wax worms.
the classic "Maggot" is a larval blue fly or other fly larva.
with that there are many negatives such as parasites. and not much food value.
so what larva are we speaking about?? and how are they raised?
explain to your buddy that crickets and other items sold for reptiles are normaly kept clean and free of parasites. "fish bait" is probably not kept as clean and could pass any of several kinds of parasites that will windup giving the dragon something like pinworms that will make it sick and could kill it.
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