I am curious about your "Fred/Ted" VanOrman. I looked thru what I have at the moment for the VanOrman surname, and the info you have may help deconflict some things.
Do you have anything else to share to include some dates and more details on the census records you've found so far...
Your mention of 'Frank' [My Francis VanOrman??] is interesting.
I've got some 'holes' which might be explained by some of what you've mentioned.
btw Did you mean Willow in Greene County Iowa?
Thanks