Yep, in the first Monster Manual, under Abomination..
I see. yeah I looked it up. Ironically a big Dinosaur is hiding in the MM : Just like Oozes, Demons, Devils 'sub classes' etc. It's like Hey where's my main man the classic Gelatinous Cube?! Oh yeah he's an ooze next to the classic Ochre Jelly.
So for example, if a party that has never encountered a kobold stumbles across some, I'd describe them, and if they pcs were somewhere where they were likely to recognize them, I'd tell them that they were kobolds and what, generally, they know about them.
That applies whether it's a newbie group or all veterans or whatever the mix.
Yeah I guess at low levels 'common' monsters should be common knowledge. Whereas rare ones lend themselves to situational skill checks depending on the DM.
Now that I look at "Tarrasque Lore" 4e MM1 pg 13 I guess for any D&D edition I was getting at this (I'll just use him as an example since I can't find the thread for the 5e excerpt but the 5e MM has no such recommended DC checks I don't think)
A character knows the following information with a successful
Arcana check.
DC 25: The tarrasque is a living engine of destruction created
by the primordials to obliterate the works of the gods. It
sleeps within the world’s core, stirring occasionally. When it
wakes, it burrows up to the surface and begins a continentwide
rampage.
DC 30: The tarrasque is inexorably bound to the world,
such that the most one can hope for is to lay the creature to
rest, forcing it to sleep within the world’s core for many years
before it stirs again. However, ancient texts postulate that the
tarrasque could be destroyed permanently were it somehow
coaxed or tricked into leaving the world.