Here's another interesting little group of Oz stage photos, once again from the New York Public Library. These are all labeled Boston in the photographers stamp, and it's possible that they may be from the Castle Square Theater production of the show, which debuted in that city in 1911.
Here we have Dorothy, and the Cowardly Lion (who was played by Arthur Hill, the man who created the role in the original Chicago and Broadway productions). A song was added for this production, called "Fraidy Cat" and sung by Dorothy in the third act. Maybe these photos relate to that song? In the library files these are all archived with Babes in Toyland, so it's really anyone's guess.