Not really. Monster Trio is a thing. There's a thread for it.
Can't remember but I thought there's a panel that talks about Franky's, Robin's, Brook's age or something like that so they establish the Mid Trio (as in like the adult trio). I could be wrong though.
About the idiot trio, Nami was just calling them idiots because they were goofing around while Nami calling Luffy, Zoro, and Sanji Monster Trio with a serious tone. Huge difference. And I'm also pretty sure that someone called Nami, Chopper, Usopp weakling trio in Thriller Bark but I can't remember.