Can you turn a Landscape object into a Static Mesh?

I am not that familiar with 3d modeling tools but I guess I will have to do some research and pick a good free program. I just need it for prototyping so it doesn’t need to be fancy.

I do need to be able to create a hexagon of an exact size and then mold a mountain on top of it though, so the easier that is the better. Any suggestions on free software?