Can a necromancer use inspiring leader to give his minions temporary hp?
Yes, by the text of the feat and the text of the types of undead that can result from animate dead, they can be given temporary hit points - assuming, that is, that the inspiring character speaks in a language with the skeletons/zombies knew in life and thus understands according to its stat-block.
RAW, yes. Personally as DM, I wouldn't allow it.
Of course, I miss the days when skeletons and zombies were mindless, and thus immune to such shenanigans.
I enjoy the non-mindless skeletons and zombies in Sam Raimi's Army of Darkness.