What is the name (in Chinese) of the utensil that is used to prick lots of tiny holes in pork skin to make it very crispy?

I'm not sure about the Chinese name for the tool, but what you might be looking for is often called a "jaccard".

Do you have a Chinatown where you're from? Generally, when I go to buy rudimentary Chinese tools, I go to places where they don't understand the concept of "online". :-P Maybe that's just around here. Though seriously, I think going to your local stores is probably your best bet. Maybe print off a picture and bring it to show them.

Anyhow, assuming I'm thinking of the same thing you are, unfortunately, I don't think it really has much of a formal english name. It's essentially a "Roast Pork poker" or "Siu Yuk Poker". I've also seen it referred to as a "Pork Skin Pricking tool". :-) See a picture here. Also here.

That said, I don't think you necessarily need one of these. My uncle makes a really awesome roast pork and I'm pretty sure he used a knife... I'd have to contact him to find out exactly how though.

Edit: I did some more digging, found this. It seems nobody knows what it's called... But there's another picture and lots of useful discussion in the comments. Then... there's a comment that suggests Amazon. If you just search for meat tenderizer there, there are numerous styles including, the western versions as well as one that looks much like the chinese version.

I found this on Amazon. It looks like the real deal around $6 + $5 for shipping. Might be able to find it in an Asian supermarket also.

http://www.amazon.com/Light-Belly-Pork-Skin-Hammer/dp/B00X72BLAG/ref=sr_1_1?ie=UTF8&qid=1438915774&sr=8-1&keywords=pork+belly+needle

I know this thread is old but maybe someone will come accross it in the future, looking for the same.

What you're looking for can be found on AliExpress.com for under $3, shipping included. Just enter "meat tenderizer needles" in the search and you'll find it (a few versions exist but the principle is the same each time).