The term 'Neapolitan' means of, from, or relating to Naples, and can refer to people or cultural characteristics identified with that part of Italy. 'Neopolitan' means, more specifically, a person from Naples.
The term 'crostini' means 'little crusts' in Italian, and refers to toasted bread, especially when served with a savory topping, or to crusty bread or breadsticks.
'Neapolitan crostini' would probably be some kind of savory, an entree or canape. A typical example would be slices of firm, crusty bread, toasted or fried and topped with tomatoes, cheese and olive oil.
Possibly the best known Neapolitan food served worldwide is Neapolitan ice cream: slabs of chocolate, strawberry and vanilla ice cream pressed together, forming a three-color combination. This triple combination of colors is used to make cakes and other foods, frequently also called Neapolitan.
Food termed 'Neapolitan crostini' would not be referring to this color-combination.
"Napoletano" is the Italian term for "Neapolitan," which refers to something or someone from Naples, Italy. It can be used to describe the dialect, cuisine, or culture associated with Naples.
crostini
Neapolitan lira ended in 1813.
Neapolitan lira was created in 1812.
Neapolitan Turk was created in 1953.
The duration of Neapolitan Turk is 1.53 hours.
The duration of Neapolitan Carousel is 2.15 hours.
The duration of Neapolitan Mystery is 1.9 hours.
Neapolitan War happened on 1815-05-20.
Neapolitan Mystery was created on 1979-04-12.
Neapolitan Mouse was created on 1954-10-02.
Neapolitan Carousel was created on 1954-05-26.