The Native American flute is unique to the individual who makes it.
A variety of woods, lengths, bore diameters, number of holes, pitch, and the decorative aspects of the flute add up to a nearly infinite array of instruments.
Native American instruments are built to a specific key, so you will need a different instrument to play in F versus G.
These flutes have undergone quite a resurgence in popularity over the last couple of decades. Books, CDs, instruments, and instruction kits for making your own instruments are readily available on-line.