Hello , I think those papayas that u are talking about are air layered papaya tops or side branches , there are videos where they show how it works. With air layering the plant is mature at the time of separating from the original and does not waste time with growing tall, dus produces papayas that literally lay on the ground. I do not know for sure ,but have heard of such varieties whom produce fruit on smaller plants ,started from seeds /dwarfs.
Now I saw u were talking bout the actual stem of the fruit ,in this case I dunno ....
