Going by my weed book, could be *Citrullus amarus (Citrullus lanatus syn.). You will have to wait to see if it ends up with a melon, but not a Paddy Melon.
Solanum prinophyllum or S. pungetium. Definitely not S. pseudocapsicum (it has no prickles). Plants in top right and lower left of photo are Sigebeckia orientalis
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