Last time I was at Pine Island Nursery, the jackfruits they had were tiny, freshly grafted, and the variety was unknown/unidentified.
I was nice and bought one only because they were selling them for $10 and the lady who barely spoke english drove me all the way there on the cart after I asked to see their dragonfruit / pitaya collection.
She thought I said Jackfruit and Papaya.
So, since she spent 15 minutes searching for the Jackfruit, I bought one to avoid the embarrassment of further confusion, smiled and left.
No idea what variety it is, but the little guy is precocious.
That said, I recommend Excalibur Red and Lemon.