Grawp is Hagrid's half brother if your looking for specific names- but they are just referred to as a species as 'Giants' if you mean trolls then that is something different.Trolls are not as big and less intelligent.
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Olympe Maxime, the headmistress of the French wizarding school, Beauxbatons. She is technically a half-giant and first appeared in Harry Potter and the Goblet of Fire
The actor's name is Robbie Coltraine, and the character he plays is Rubeus Hagrid.
i can name 7: Harry Potter and the Sorcerers Stone (or Philosophers Stone if in Great Britain) Harry Potter and the Chaber of Secrets Harry Potter and the Prisoner of Azkaban Harry Potter and the Goblet of Fire Harry Potter and the Order of the Phoenix Harry Potter and the Half Blood Prince Harry Potter and the Deathly Hallows
Rubeus Hagrid is probably the character you are looking for. Hagrid is a half giant and is known for having long unkempt hair.
There is no scientific name for Harry Potter.
Harry Potter and the Sorcerer's StoneHarry Potter and the Chamber of SecretsHarry Potter and the Prisoner of AzkabanHarry Potter and the Goblet of FireHarry Potter and the Order of the PhoenixHarry Potter and the Half-blood Prince
The Half Blood Prince in the Harry Potter book series is Professor Severus Snape. Snapes father was a muggle and his mother was a witch whose last name was Prince.