I forgor💀, then a monster

Gator Snake

^^ no, those kinds of creatures are simply called M.U.T.Os. Before you ask, the Kaiju from Godzilla 2014 were only referred to as Mutos since back then, Monarch didn't have a name for them yet. They're now called Jinshin-Mushi.

I would call them MUTO if I knew there is no Godzilla rookies that would get confused

I think it's more calling Gojira, Godzilla. So we call the Jinshin-Mushis, MUTOs; but again I prefer to just call them Hokmuto, Femuto, Queen and Prime.