This idea seems as feasible as an Earth crust displacement. The mechanism behind it would be the same: the different parts of the Earth have a different rotational speed and a different moment of inertia. So if the total system changes its rotational speed, the different parts will react to this change differently. That would cause oscillations between the different parts.
And this could cause slow Earth crust displacements, but possibly also more sudden oceanic displacements as water is much easier to move.
Such an event could maybe be an explanation for animals that are found in the ice.