I was talking to a contractor who was replacing my roof. He was telling me about a mango he had down in Kissimmee. He said the fruit was very small, very sweet but also had a really small seed. He said the owner called it a pineapple something. To complicate things his English wasn't too great.
Without pictures, I'd bet its a random seedling.
Outside of the enthusiast circles, these new Zill mangos are pretty unheard of.
Also in the Orlando/Lakeland area, having grafting mango trees that will survive unprotected through winter is a relatively new phenomenon.
Most of my family and friend and now growing the rootstock if they bought grafted trees.
I can understand people referring to any yellow slightly sour mango as a pineapple-mango.