EDIT: The two addresses below now both redirect to http://sigaintevyh2rzvw.onion/, so it seems they closed their node. I'm not aware of any other public Freenet node on TOR.
Yes. There is a public Freenet node on TOR, or maybe there are two.
They are both set up identically, even with the same information on an about page (freenet7..., freenov...), so I don't know if they are the same machine with two addresses or if one is a mirror of the other. freenet7... seems to be the official one, but maybe they put up the other address because the original is blocked in the ahmia.fi index, probably due to the unaccepted, now filtered, content mentioned in the about page.
It's run by the SIGAINT people, who bought it from the previous admin earlier this year. (announcement on /r/onions, see also the about page mentioned earlier)
Anyway, this in combination with e.g. http://onion.link/ means that Freenet is now indexed by Google (about 5000 results).