After finding Grom Hellscream and proving himself, Thrall was taken under Hellscream's wing and taught the Orcish tongue.
Grom revealed to him that Thrall was part of the exiled Frostwolf clan, as evidenced by the tattered swaddling cloth Thrall showed him.
How long a work has been around has an effect; it's not hard to use a lot of tropes when you're a Long Runner.
Not to be confused with Overdosed Tropes, which are the same but inverted.
Taretha wrote Thrall letters and secretly delivered them to him in his cage within books, and he wrote back to her.
Eventually, he wrote to Taretha that he wished to escape.
He takes individuals at face value and treats them with respect until their actions prove that they should be dealt with otherwise.
Orgrim Doomhammer (mentor, friend and former warchief), Drek'Thar (shaman mentor), Grommash Hellscream, Aedelas Blackmoore (former slave master), Sergeant (former gladiator trainer), Medivh (in the Third War) was the Warchief of the restored orcish Horde and ruler of the red land of Durotar in Kalimdor.
Before the Cataclysm, he was Warchief of all the Horde, but temporarily gave leadership to Garrosh Hellscream Despite Thrall’s open acceptance of visitors into his society, the orcs have not yet relinquished all of their old hatreds and preconceptions about other races.
Visiting hunters often bring meat or fur in exchange for refuge from the elements, and human traders from Theramore Isle periodically bring casks of salt ale and seed for crops.
While in Orgrimmar, visitors are under Thrall’s protection and he will not tolerate any threats or violence against them. He is rarely alone, and in battle often spends much of his time directing his troops. He mixes a judicious amount of melee with powerful spellcasting to great effect.