I tried doing some research into what might be causing the damage, as the vine is also damaged slightly. I looked around the rest of my garden and the winter melon and hairy melons are growing perfectly. The pumpkins are also growing without a problem, so I am at a loss to why the Piel De Sapo is growing at a sub-par level.
I believe it is some disease but I haven't had any experience with growing this type of melon. There isn't much information online I'm growing this in Sydney, from a melon I bought at Costco Australia.
Any ideas? Or is this just basic insect damage? If it is insect damage, then does anyone have any ideas on what I can use to deter these insects?