Hello Jasper,
There is several vernacular terms for this, and as a timber wright, I use them all the time. Some are regional terms, but most in the traditional/historic building/architecture profession, know the material as:
"Live edge Fletch or board,"
"Log Fletche,"
"Adirondack board or siding"
There are a few more but rarely used and very region specific.
Hope that helps.
Regards,
Jay