Well... sort of. Other Keyblade wielders can hold each other's Keyblades and use them, but I don't think you can give them to just anyone. Not unless they have the potential to.

[To prove his point, he'll offer Oathkeeper to Heizou, and he can pick it up if he wants... but if he does, after a couple of seconds, the Keyblade will flash and fade away, and reappear back in Roxas's hand.]