Example. create a geometry, select it, Ctrl+9 and create ICE tree, plug anything, then freeze.
edit.. I suppose is working as intended, but it would be nice if in the next version It would be added in the softimage users guide that freeze also removes the ICE Tree (my mistake, I didnt thought it was an operator). Lucky for me Im doing personal stuff so trial and error helps a lot when learning, so from now on "Freeze M" will be my new best friend and "Freeze" his evil twin.