There was a post about this before with the Guinness World Record book. I think the owner even commented here. Supposedly the world record is 5 kinds of fruit on 1 tree. I know many nursery sells a fruit salad tree too. I got one from Restoring Eden a year ago and it just ended up being a mix of nectarines and peaches though. https://www.guinnessworldrecords.com/world-records/tree-with-most-different-fruit#:~:text=The%20most%20types%20of%20fruit,almond%2C%20peach%2C%20and%20cherry.
Edit edit here is the post with the one where the forum member commented on it World record for most fruits on one tree - #14 by disc4tw