Yes. The simplest approach is to scan with the scanner lid open and use a large book to gently press the print flat against the glass. Avoid using something so heavy that it could flex the scanner glass. The main difference with the lid open is that uncovered areas may scan as black instead of white.

If you want to reduce the curl first, a humid environment may help soften prints, but avoid any condensation or free water on the print because it can damage the print or make it stick to the scanner glass.

For fiber-based photographic paper, one answer suggests washing briefly in running water, then soaking for a few minutes in a glycerin-and-water solution, and drying the print flat between clean towels under a book. This is a darkroom-style flattening method and is only appropriate if you’re comfortable risking the print.

Another option mentioned is heat pressing between protective layers, but this is riskier and easier to damage the print with. For scanning alone, pressing the print flat with the lid open is the safest and easiest method.