[Tuor of Gondolin]

Okay. I've checked Firefoot 's question and,
as far as I can see it's not in The Silmarillion. I
found the reference in another work.

Btw, as a general rule I think it would be too easy
and mechanical to allow questions as to what book
something is in, since it could progress to "Is it in a
given chapter?", "Between pages so-and-so?", etc. But
in this case I'd say it's a valid line of question, especially
since the group/incident I'm thinking of is only mentioned,
as far as I can determine, in one not overly obvious place,
although it is a valid bit.

Third Age? Yes. Highly probable.
First Age? No.
Second Age? Yes.
Man (as in race)? No.
Living? Yes.
Elf? No.
Dwarf? No.
Auinu? No.
Olvar? No.
Ent? Nope.
Snow-men of Forochel No.
Evil? Not so.
Plant? No.
Thorondir??? No.
Does it have a gender (not is it known; does it have one)?
Yes. It/they do.
Is it a single living thing rather than a group? No. It's a group.
Was any part of it ever in Numenor?
Yes. At least some of the group was definitely in Numenor.
Are the members of the group able to talk? Yes.
In The Silmarillion? No.