I hate this meme. It tries to make questions that can be answered in five second’s thought into massive gaping plotholes.
 
Talk about mountains to molehills.

Flutterhax.

Gee, it’s like they don’t have any way of teaching them stuff they’ll need to know when they work for unicorns and earth ponies…ON THE GROUND!
 
Just because she’s never seen them before, IN PERSON, doesn’t mean she doesn’t know what they are. A person can go through their entire life without seeing an exotic animal for themselves, but they can tell you what it looks like by the description or, you know, picture of what it looks like.

She didn’t know their names. She GAVE them their names.

1st rule of songs: during them actual events can and usually will be ignored

Its a musical

Maybe they have zoos in Cloudsdale?

She knew their names, just not that she could find them all in one place.

She knows about them, but has never actually seen them before.
 
Also, she read it in a book.

So what, I’ve never been to France yet I know of the landmarks there.

She said in the episode she has never been to the ground. When she got to the ground, she was surprised about seeing animals… Yet knows all the animals names…. Seems legit.

to be fair, new species are constantly discovered

Like all of the animals only live in one place.

She’s got the shinin.

She read it in a book.