Freehand drawings (like .fh11) are not supported in Photoshop and it is unlikely you will find a direct fh11 to psd converter and thus successfully converting Freehand to Photoshop can be very difficult.
However, Photoshop probably can work and import Illustrator drawings (or can work with something Illustrator can export) and there are ways how to convert Freehand drawings to Illustrator, so through a long workaround you might be able to manually achieve fh11 to psd conversion.
There is a script available for download from Adobe that allows users to import old FreeHand drawings (like .fh11) directly to Adobe Illustrator and save them as .ai drawings. This option however seems to be working only for CS4/CS5 versions of Illustrator and does not work for the latest CC.