This matters to no one but me but I can't stop thinking about it let's goooooooooooooo-
****THIS IS ALL MY SPECULATION SO TAKE IT WITH A GRAIN OF SALT****
So we know that the humans kept by the circus are referred to as Fools and Dolls. While those could be interchangeable terms, I think they're at least slightly different.
I think dolls are humans that the circus keeps and belong to specific members (shown by the marks on the mask-- Carol seeming to have been claimed by the Ticket Taker, and the other obviously being claimed by the doctor.)
I believe that Carol and the human handing you the agreement to sign are 'dolls'. Their outfits are slightly different from the fools we see handing out flyers. They have more black in their outfits as well as bows around their necks, rather than the necklace with the bells.
We do actually see Pierrot's doll/fool mask too! On the mc and the Coffee Karen.
And I think fools are more disposable and open season for being killed. Like the woman playing Columbina in the play Jester puts on. (Though I believe the reflection of the doctor talks about experimenting on dolls so they are not safe from being killed either lol)
Something that threw me off when I saw it was the mask of the fool representing Harlequin during Jester's performance. That mask is the same as Harlequin's, rather than the simplified fool mask.
But I think I figured it out. lol
I think all the masks worn by the fools in Jester's show are different from the typical fool's mask. We see the Doctors mask and ticket takers masks being more accurate to the actual members of the circus, rather than what the fools/dolls usually wear. Presumably just for the show.
Is there a point to this weird diatribe?