Forbidden Forest question

[Carol]

I was wondering on the Movie list what happened to the other
Hippogriffs the five that didn't make it into the PoA film and any
others that Hagrid might have been looking after (or intending to use
in COMC classes that were never taught). Zanooda suggested that Hagrid
gave them names but didn't make them into pets because they weren't
involved in special circumstances as Buckbeak was after the Draco
Malfoy incident. That makes sense to me and would also explain why
none of them showed up with the Wizard-oriented, half-tamed Buckbeak
at the Battle of Hogwarts.

That led me to wonder what creatures are still left in the Forbidden
Forest, not counting a flying Ford Anglia and possibly a flying
motorcycle wandering wild in the forest. Grawp is tamed and no longer
there; the unicorn-blood-drinking creature that was really
Quirrell!mort is gone. The Acromantulas, at least the adults, seem to
have been killed at the Battle of Hogwarts, and if I were the new
headmaster, I'd make sure that the whole colony and its burrow were
destroyed. (Ordinary spiders, though, you just have to live with.) The
Werewolves, I think, were just a legend. I can't imagine feral people
who turn into werewolves on a full moon night living undetected in the
Hogwarts forest. That leaves Unicorns, Centaurs, and Thestrals.

Possibly the little twig people whose name I can't remember live in
wandwood trees in the Forbidden Forest. Might Hagrid have gotten some
of the other creatures that the students studied or tried to study in
COMC there? No the Blast-Ended Skrewts, obviously, since Hagrid bred
them (from what, I don't know) and probably not the Salamanders (the
mythical variety that live in fire, not the actual amphibians). Frogs
and newts, those mundane but still magical creatures, probably live in
the lake, along with the Merpeople and Grindylows (and maybe
Flobberworms)?

Carol, who doesn't have time to look up all the creatures in Fantastic
Beasts to see which ones are native to England or Scotland and is just
wondering whether it's reasonably safe to wander in the forest
post-Voldemort and where Hagrid found his creatures