Looks rather like a calabash.
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Is it not like a maracuya (passion fruit) or grenadilla? You’re right it looks unripe
It looks like a green passion fruit to me (maracujá in Portuguese and I believe maracuya in Spanish). If you open(ed) it you should be able to confirm with fairly high confidence, although I've never seen the inside of a green one.
See this photo for comparison with yours: https://www.shutterstock.com/image-photo/green-passion-fruit-parcha-o-verde-1540775528 And one of the inside of a ripe one: https://www.shutterstock.com/image-photo/passion-fruit-cut-half-isolated-on-2588726317
Captcha-walled. Can you upload the image of the inside of the green passionfruit in a reply to this comment?
Ah, sorry, I didn't realize. I would, although @JackFrostNCola@aussie.zone already posted one. I hadn't found a picture of the inside of a green one yet anyway. Only of the ripe ones.
I agree with the poster above you, the leaf stem in particular looks super passion-fruity to me (source: i have a regular passionfruit vine), and not rhe image from above link but here is something i searched up

Andean walnut?
Definitely not that.
I see. Texture looks similar but it looked bigger than normal anyway. Well, if there is no hard shell inside, it's definitely not that.
I can say with confidence that it isn't Juglans neotropica due to the elevation at which it was found, but if I seemed overly dismissive, that wasn't the intention.
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