How many instances of p are there in:
Q: Are there unicorns in Harry Potter? In which HP movie is something looking like an unicorn?
Are they really unicorns, or does it have another name ?

A: Yes.
The first time we see mention of unicorns in the Harry Potter series is when Harry is looking at unicorn horns for sale:

Hagrid wouldnt let Harry buy a solid gold cauldron, either (It says
pewter on yer list), but they got a nice set of scales for weighing
potion ingredients and a collapsible brass telescope. Then they visited
the Apothecary, which was fascinating enough to make up for its horrible
smell, a mixture of bad eggs and rotted cabbages. Barrels of slimy stuff
stood on the floor; jars of herbs, dried roots, and bright powders lined
the walls; bundles of feathers, strings of fangs, and snarled claws hung
from the ceiling. While Hagrid asked the man behind the counter for a
supply of some basic potion ingredients for Harry, Harry himself
examined silver unicorn horns at twenty-one Galleons each and minuscule,
glittery-black beetle eyes (five Knuts a scoop).
Harry Potter and the Sorcerer/Philosophers Stone, chapter 5: Diagon Alley

And then... spoiler for the first installment, since you dont seem to have read/watched it:

 Harry has to go with Hagrid to find a hurt unicorn in the forest, which turns out to have been killed by Voldemort drinking its blood.


Look there, said Hagrid, see that stuff shinin on the ground?
Silvery stuff? Thats unicorn blood. Theres a unicorn in there bin hurt badly by summat. This is the second time in a week. I found one dead last Wednesday. Were gonna try an find the poor thing. We might have ter put it out of its misery.And what if whatever hurt the unicorn finds us first? said Malfoy, unable to keep the fear out of his voice.Harry Potter and the Sorcerer/Philosophers Stone, chapter 15: The Forbidden Forest

And since youre asking about the movie, heres a screenshot of the unicorn mentioned above from the first Harry Potter movie:

 


A: Harry sees a dead Unicorn in the first movie when he visits the forbidden forest as punishment.

 


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The text includes 28 "p"s in total.
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