Move files if file name doesn't exist considering extension

For example, in folder A, I have foo.jpg and bar.jpg. In folder B, I have foo.png and foobar.png. I only need one version of the file regardless of the extension, so I only want move foobar.png to folder A. How can I do this? This is a simple example, there are almost 2,000 files in folder B, so comparing manually would be very tedious.