The name"Monster Trio"

[itachi1000]

Just curious, but when exactly have Luffy, Zoro, and Sanji been called the Monster Trio?

 

[kmrasengan]

I tought it was just a name the fans gave them to separate them from the rest of thr crew, you know, like power levels.

 

[KGB Kakuzu]

Yeah I'm pretty sure it was a fan made title

 

[Ace of the fire fist]

I don't think they actually were called the monster trio. They were, on separate occasions praised for their superhuman abilities. That's really about it. I think it's just a moniker the fans came up with.

 

[Aertes]

I think Namy called them like that once,when Luffy tried to help them somehow and she got hurt and told him don't compare me with your monster trio.And then I guess the fans liked it and sticked to it.

 

[Skylar Knight]

It was the crew that called them "The Monster-Trio", and it was stated in the One Piece wiki, as you can see here:

Spoiler

All of them have at least one talent at which they are virtually perfect at and each member is, more or less, a formidable if not downright fearsome fighter in their own right. While all of them have amazing strength in one way or another, three of them, the captain, the swordsman, and the chef, have such astonishingly inhuman strength that the rest of the crew have dubbed them the "Monster Trio".

Source:

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[-Ibrahim-]

Nami or Usopp called them Monster Trio during Alabasta arc when they were in the desert i think.

 

[Frozenstein]

ah you beat me to it. Nami called them first monster trio.