That's a very strange request. You really need to clarify it with him - as in, what is the idea behind this.
The best place for human allele frequencies is gnomAD; however, these variants can hardly be viewed as novel. By far not all of them are characterised, of course.
If he's looking for smaller populations with some unique variants, that's possible, but certainly would not be available without a publication. E.g. we published allele frequencies from of Northwest Russia, with approximately 700 people in the larger cohort. Obviously there's lots of similarity with general Europeans and Finns, but also some unique components.
Finally, you can get access to some protected studies using dbGap. It's quite hard though, and you need to know exactly what you want before going through with the application process.