[crow + keeper]
obs. : a person employed to scare off crows
We'll have no Cupid hoodwink'd with a scarf,
Bearing a Tartar's painted bow of lath,
Scaring the ladies like a crowkeeper..
- Wm Shakespeare, Romeo and Juliet (1597)
It was the technology of the scarecrow, presumably, that
made the crowkeeper obsolete.
- m-w.com