So the frunk can open with the truck is in drive/reverse? Doesn’t sound right.
Sure it does, to an extent.
Pay attention to the frunk when it opens. There are two distinct actions, unlatch and open. The first unlatches the frunk, the second slowly opens the frunk. We know if the truck is stopped and in Park, pressing the button unlatches, then activates the opener. My guess is that pressing that button while moving causes the frunk to unlatch and the alerts on the dash to come on indicating the frunk is ajar. That may be a non-dismissable warning. However, I doubt the frunk will lift open. When the truck then stops, the frunk may automatically open or may require a second push of the button when stopped before it opens.
If someone would like to climb into the frunk and try this while moving, we'll have the answer*.
*Requires professional stunt team on closed course. Do not try this at home.