When you die do you grow an extra finger?

You can grow pretty much anything on anything on an animal on Earth. How would you do this you ask? Stem cells. For Human fingers, just grab some stem cells, program them to grow into a finger, and then pop it on. Of course, "popping it on" is much more complex than it sounds. You would need to go through surgery to attach nerves and blood vessels (your body might also reject the finger entirely). In other Words, unless you have a vast fourtune, no.

Also, babies can be born with extra fingers because something in their development, which stemcells help program, results in an extra finger.