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If TC saw freehand with a lower case F, then it might not refer to the program, but the verb. You can create freehand drawing in PS with either the pencil tool or the paintbrush.
On the other hand, if it really is Freehand, then you can save a PS file in eps format, which I think that FH can open. Just don’t expect raster things to magically be in vector format.
It’ll probably open in FH. But they might want something in the native FH format that they can manipulate. You probably can’t provide that with Photoshop. I would ask them if an EPS in PS will be okay (maybe send off a sample).