Hi KC,
Seen the same in the yard and on fence post here, close to feeder. Bird(s) in adult plumage. Never have I seen and heard any vocalization from them when it was observed. Has always been in late spring, early summer. EDIT: Plural events, with singular male birds END EDIT
My thought, without evidence is a second year young adult that has undergone all molts up to adult prebasic molt. Essentially, a bird that appears as an adult, learning to fully be an adult,
but not quite having 'caught on' yet.
But, I've also seen the same with attached pairs, when the male behaves in the manner describes, but a female arrives to present food to it. I couldn't find a valid citation to back the ideal. In this sub forum, there's an thread that relates to geese called 'Geese on the Move', there's a few links that describe how sub adult geese form small flocks and move around, on occasion. Loosely, what you're describing does seem to parallel the same general, although not specific, behavior.