Remember that there were several OZ movies before the MGM version. B&W, silent productions done with Baum's involvement. I have never seen them; I understand that they are rather slapsticky.
And there have been three live-action movies, two cartoon series, and one CGI cartoon feature since then. Maybe more . . . I understand that a serial-numbers-filed-off version of Oz was big in Soviet era Russia. I bet some movies emerged from that.