they do sometimes call heroin "Manteca"....I used to hear it all the time when there was a lot of open air going....They also call crack "pollito", which basically means "little chicken"...They used to say it when you'd walk by, "Pollito...Manteca"....If you knew what "Manteca" meant 10 years ago, it might have given you a little more cred when trying to cop, but these days not so much....There's not many Puerto Ricans or Dominicans running around who don't know the English slang for the drug they're dealing, so most of them just call it dope...or "do'"...lol
Heard some people call dope "Dog Food" in NYC...which kind of makes sense if you think about it...