1920 Sacred Heart, Renville, Minnesota Frank N. Olson, b. Norway, 32, roomer, single, imm 1908, naturalized 1919, works on ditching
I looked for him in the Minnesota death index but he's not listed.
If he moved to North Dakota and died before the 1930 Census, he's going to be difficult to find. North Dakota doesn't publish a death index. Generally people check cemetery indexes in the county where the person last lived or obituaries.