Grafting of Watermelon & Papaya

Watermelon papaya

Is this picture for real? Anyone with experience in grafting Papaya & Watermelon?
I would be very interested in learning this technique.

Highly likely to be a doctored photo. Do you know the source of the photo?

Someone sent it to me via whatsapp, and when I googled it, I found it here.

They’re completely different plant families, so I don’t think it’s possible