Sounds like a standard Creole language. I know that phenomena related to merging languages of populations in contact are well studied, but don't know enough to link to any relevant lit. sorry.
Creole languages are more about "20 people speaking 20 different languages create a new common merged language", spanglish sound more like "20k bilinguals with varying preference between the 2 languages mix and match the 2 languages for convenience".
This assuming that most spanglish speakers could hold a conversation in either languages.
If you can provide an example of such a diverse set of languages becoming a new language, that would be interesting.
Creole has nothing to do with the number of languages. Creole is what you get when two groups of people with no bilingual speakers are forced to interact and develop a new language. Normally, it starts as a pidgin to facilitate trade but then develops into a full fledged language. The main difference with Spanglish being that the speakers often know both languages to a modest degree but probably would not be considered native by other native speakers. Also, there are almost 1M Dominicans alone in NYC. 20k makes it sound like some cute phenomena happening in Little Havana in Miami.
I agree, I was misremembering. After a quick refresher I agree that spanglish fits the Creole definition much better than I initially considered.
> there are almost 1M Dominicans alone in NYC
Not all 1M people interact with each other, I was talking about the overlapping sets of social circles areound people, not the total count.
Spanglish is not a creole or dialect of Spanish because, though people claim they are native Spanglish speakers, Spanglish itself is not a language on its own, but speakers speak English or Spanish with a heavy influence from the other language. (https://en.wikipedia.org/wiki/Spanglish)
It's certainly not 20 languages, but Singlish (Singapore creole) has a number of influences.