What is SSJ rage?
Super Saiyan Rage ( 超 スーパー サイヤ 人 じん 怒り, Sūpā Saiya-jin Ikari) is an extremely powerful form in the Super Saiyan line of transformations. Much like the regular Super Saiyan form, It is assumed through the power of intense rage.
Is Frieza a good guy now?
No. He is still a bad guy. He says that in the episode that he will follow his evil ways.
What is Goku’s surname?
Goku’s full name is Son Goku, “Son” being the family name and “Goku” being the given name. It comes from how he was originally modelled after the Monkey King Sun Wukong from Journey to the West, “Son Goku” being the Japanese reading of “Sun Wukong”.