MGGS is the standard grappling hook. I have not seen a use for them other than datacrons.
The explosive is for one of the Alderaan datacrons, and is consumed upon use (I think).
The Ice thinner is used for one of the Hoth datacrons, and like the detonator, consumed upon use (again, as far as i remember).
Of course, that does not mean that there cannot be another use for any of these items, but I doubt it. Especially for the latter two, as they are quite specific and one-time use.