Thanks Michaela, but the one thing I have established is that it probably isn't a squash. At least not one native to China. The Chinese name also doesn't suggest squash. The last character is definitely 'fruit'. Squashes are all 瓜. Nor did it smell like a pumpkin when I bought it. Now it smells of nothing. It also cost five times what the baby pumpkins go for.
Then Google search wiil turn up similar pictures, but the text mentions nothing about pumpkins or squashes that I can see.
We have baby squashes / pumpkins by the ton here. I can;t see why they would come up with a totally different name for once.
I did ask the staff but the fruit is on the imported weirdness shelf and they haven't a clue. If it were a pumpkin they would know.