mountainboard
Concise Oxford English Dictionary © 2008 Oxford University Press:
mountainboard/ˈmaʊntənbɔːd/
▶noun a board resembling a skateboard with four wheels, used for riding down mountainsides. ▶verb (often as noun mountainboarding) ride on a mountainboard.
– derivatives
mountainboarder noun.
mountainboarder noun.
'mountainboard' also found in these Oxford entries:

