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Kakarrot is Goku’s Saiyan name. It’s what Vegeta and other Saiyans call him when they’re too lazy to say his Earth name. But everyone else calls him Goku because he’s a total goofball.
'Kakarot, why did you eat the whole pizza? You’re gonna be fat like me!', Vegeta
'I’m not a Saiyan, I’m a Kakarot!', Goku
'Kakarot? That’s the stupidest name I’ve ever heard!', Krillin