New York Public Library Digital Gallery.
Here we have an unidentified pair of performers, in costume as the Scarecrow and, could that possibly be, Jack Pumpkinhead? These are from a group of photos printed on a contact sheet, with no information other than the name of the photographer, White Studios in New York City. They were filed under Wizard of Oz, but I don't think this has anything to do with the Broadway Wizard. There is no date to help with identification, and these could easily be an unknown pair of vaudeville performers. (Note - see the comments below for identification of these performers).
This certainly isn't Fred Stone and David Montgomery, and I know of no occasions when these two characters would have been together in a stage production - if that actually is Jack Pumpkinhead. There is a definite resemblance to the makeup style used in The Wogglebug, the unfortunate show that never made it to Broadway, and featured Jack Pumpkinhead as seen on the right.
The Scarecrow is clearly copied from the Fred Stone character, with a notably different hat, but the other figure is harder to place. It's a bizarre and intriguing couple of images!
Here's a final shot, showing the two performers in more standard outfitting, as well as in character. Another little mystery waiting to be solved...