You may not be able to move objects that are on dead land, but if you line up like objects near it to create a merge, it will pull the one(s) off dead land to use in the merge!
Any dead land underneath will be instantly healed! Sometimes you even NEED to do this to complete certain levels.
Align similar objects next to ones on dead land:
They merge, pulling the one(s) off dead land:
The dead land under the object that was pulled off this way will instantly heal!