"Pastéis de Nata" would be the plural form. Yes, they are amazing. I never understood why they were not more popular in Massachusetts, given the huge Portuguese population there.
Pasteis de Nata/Belem are most common from Lisbon on south to the Algarve. Most of the Portuguese in Massachussetts are from Porto or from the Azores/Madeira. You are more likely to find Lisboetas in New Jersey and Toronto.
Pasteis de Nata are one of my favorite foods of all time, but they were fairly uncommon where I grew up in an Azorean Portuguese community in California, although Queijadas are pretty similar.
That makes a lot of sense. But still, it is pretty rare over there. Search for "pastel de nata" on yelp for Cambridge shows only 5 results, and only restaurants who happen to have them. Not one single pastry/coffee shop.
What I think it's funny is how the Portuguese focused so much on working as real estate developers/contractors and basically never took the entrepreneurial spirit to any other industry. If I were in MA, I would look into getting a coffee shop that served only a good european-style espresso, pastéis de nata e ginjinha. I bet it would find a good number of customers.
Pasteis de Nata are one of my favorite foods of all time, but they were fairly uncommon where I grew up in an Azorean Portuguese community in California, although Queijadas are pretty similar.