If you cant overcrook a rail, then you shouldnt be able to crook a rail either by that logic.
And if that were true, then Koston wouldve ran around nosegrinding all the rails on our planet and a K-grind would refer to a nosegrind and not a crook.....So fuck yeah its possible! If your front truck is grinding and your tail is not aligned with whatever youre grinding.....its not a nosegrind.