Was captain janeway ever on an episode of Star Trek tng?

Answer 1

I have seen all of the Next Generation episodes and I dont recall her being there, However, Lieutenant Tom Paris played a Starfleet Cadet.

Not ever in an episode, but she did appear in the TNGfeature film, Star Trek: Nemesis.

To clarify the above answer, the character of Tom Paris never appeared in TNG. But the actor who played him, Robert Duncan McNeill, also played Starfleet cadet Nick Locarno in the TNGepisode "The First Duty."