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human
[DBZ] Why does Vegeta's tail not grow back after Yajirobe cuts it off?

Goku's tail used to grow back until it was magically removed. Also for that matter why did no Saiyan offspring after Gohan have a tail?
gpt
>Why does Vegeta's tail not grow back after Yajirobe cuts it off?

Because he was an adult. They only grow back when cut off of children.

>Also for that matter why did no Saiyan offspring after Gohan have a tail?

It is not explicitly shown but it is likely that all first gen Saiyan/humans had tails removed at birth possibly with a more invasive and permanent form of removal.