We don't have synonyms for napolitan yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are Neapolitan, neopolitan and napolitano.
(n) :
Alternative form of naporitan (“a Japanese dish styled on Neapolitan food”). [A Japanese dish styled on Neapolitan food; spaghetti topped with ketchup or tomato sauce, onion, button mushrooms, green peppers, bacon and Tabasco sauce.]
(n) :
Alternative form of naporitan (“a Japanese dish styled on Neapolitan food”). [A Japanese dish styled on Neapolitan food; spaghetti topped with ketchup or tomato sauce, onion, button mushrooms, green peppers, bacon and Tabasco sauce.]