Donald R. Frugoli (birth date 04 Dec 1920 in Fresno, California) died in Pocatello, Bannock County, Idaho, on 07 Mar 1922.
His death certificate recites his father's name as Dante Frugoli, and his mother's name as Lulu Blue, born in Kansas. Residence at the time was 429 N. Seventh St., Pocatello, Idaho.
Now it says Blue, Not Blau, but it seems a strong likelihood that they are one and the same person. I think a little more digging could verify or eliminate the possiblity.