The seller of these “breast melons” is perpetrating a hoax. This picture comes from an art installation in Vietnam, not from an actual plant that was grown from seed. (I can’t show the nipples here, as stupid as that sounds, but the original picture’s on the listing.)

They’re regular squash seeds, according to the reviews of people who bought and grew them. It’s more believable than the people selling blue strawberries, but it’s still not real, unfortunately.