The Republic of Palau is an island country in the western Pacific, in free association with the United States. In one way or another, the country has been under US administration since it was established, and has never had its own separate currency - it has always used the US Dollar. However, Palau allows some foreign mints to issue coins under its authority; these are denominated in US Dollars but are only legal tender in Palau, so can in a way be considered to be in "Palau Dollars", even though such a currency does not officially exist.
The coins are usually dedicated to historical or general popular culture themes not related to the country itself. Many of them are in standard bullion sizes, including the internationally popular one troy ounce of silver.
This coin is part of the Silver Charms collection featuring specially shaped coins.
The Mint says about it:
These 3D 1 oz pure silver coins utilise smartminting technology to appear sculpted even though they are struck just like standard coins. This year’s Silver Ghost brings life to our childhood memories. Countless of children have donned the white bed sheets and said “boo!” in an attempt to scare their parents and friends. Of course, who could ever forget the friendly ghost that is the main character in cartoons and product promotions. On the scarier side, ghosts have always been the main subject of paranormal studies and talking to the dead. No matter what your memory is, you will love this amazing ghost! | 
Search for Palau: Silver Ounce 2022 Silver Ghost on eBay 