Sugar pigs hold sugar and are great to have for those guests who wish to sweeten their coffee,tea, etc...
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I suggest you look online using the more common term "sugar bowl."
I don't know the origin of the term "sugar pig" but doing a quick search both on Amazon.com and Google indicates the term clearly is not commonly used.
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Wow they are hard to find. If you Google it, then look at images. Scroll down and you'll see a picture of two pottery sugar pigs with a cork in their nostril. The website is visible if you click on the photo. They are listed at $15 each. Apparently that is also a breed of tiny pigs. Enjoy the photos.
I am not familiar with sugar pigs. You could instead use a salt pig. Salt pigs are very common and readily available online in a large variety of sizes and colors. Search "salt pigs" and you will find many sources for purchasing online.