the.com/papaya tree

means A fast-growing tropical plant with a tall, soft, unbranched trunk topped by a crown of large lobed leaves and sweet orange-fleshed fruit, that looks like a tree but is botanically an herbaceous plant.

from "Papaya" likely comes from Carib or Arawakan languages of the Caribbean, picked up by Spanish and Portuguese explorers (compare the related form "papaw"/"pawpaw") and spread into English from there. The "tree" part is simply English doing what it does with any tall woody-looking plant — slapping on the familiar word — even though the papaya's trunk is actually soft, fibrous, and unlined by true wood, making the name a well-meaning misnomer rather than a botanical fact.