I am looking for a word that can be used to describe a person who can switch bodies with another human
Not to be confused with a person who can morph themselves into someone else or a creature by will, but someone who has an ability to body swap - without necessarily having control over it. I am writing a short fiction story and I am looking for acceptable sounding names/words to describe this action and the scientific name for body swapping.
I have come across Changeling, Morphling, and Automorphic but all of these suggest a way of having control over of changing ones own physical appearance. I am looking for something more specific to the actual switching of bodies.
This young woman has known since she was a child that she was able to [transcend into someone else's body] for an unknown amount of time but she could not control it.
Bonus points if it's SciFi jargon.
Assuming that you mean the character can’t control the ‘ability’, rather than can’t control the body they occupy, then you seem to be talking about a form of possession. Most commonly this is identified as a supernatural phenomenon taking the form of demonic or spiritual possession
Demonic possession, psychokinetic control of a person by the Devil or other malevolent spirit.
Spirit possession, psychokinetic control of the behavior of a living thing or natural object by a spiritual being
but essentially comes from the obsolete meaning of ‘possess’ as ‘to inhabit or occupy’ giving a modern meaning of
To take control of someone's body or mind, especially in a supernatural manner.
As to what people with the ability to possess others might be called, it is quite likely that the general population might call them witches or devils, what they call themselves may be very dependent on how they see the ability and how they use it.
Terry Pratchett used the gentler concept of ‘borrowing’ for characters who could ride in the mind of another but chose not to control the owner (other than the odd nudge).
I'm going out on a limb here. I would suggest, as you seem inclined, using the diminutive suffix -ling with the appropriate descriptive word indicating an immature one, new one, or small one. The limitation is with the descriptive word that you use. From your description you describe a mutual experience - to switch, swap, trade, or exchange awareness. I think "switchling" might work. Or, if the switching process allows, possibly "graftling" or "spliceling".
http://www.dictionary.com/browse/-ling