QIs "You may only use Bloom Effect "Going Full Fangirl!!" once per turn." for the 《Bloom Effect》 "Going Full Fangirl!!" of hBP02-051〈Kureiji Ollie〉 different from [1/Turn]?

AFor [1/Turn], each of those abilities may only be used once per turn. However, for the 《Bloom Effect》 "Going Full Fangirl!!", it means that 《Bloom Effect》 of the same name may only be used once per turn.
For example, if a hBP02-051〈Kureiji Ollie〉 that has already used 《Bloom Effect》 "Going Full Fangirl!!" is on the stage, even if another hBP02-051〈Kureiji Ollie〉 was bloomed, the 《Bloom Effect》 "Going Full Fangirl!!" will not trigger.

QCan I bloom a holomem that already bloomed this turn with 《Bloom Effect》 "Going Full Fangirl!!" of hBP02-051〈Kureiji Ollie〉?

ANo, you cannot.
This ability may only be used to bloom a holomem that hasn't bloomed that turn.