Wiktionary
frog hair
n. (context golf English) The closely mown grass that surrounds a putting green, between the putting surface and any rough that might also surround the green.
Usage examples of "frog hair".
He'd jump all over the stage swiping wildly at the air, come within a frog hair of splatting his fist into the chafing dish a dozen times, get the girl volunteer to flap her arms to flush the little buzzers his way, and all the while talking his talk about the similarities and differences between Herefords and bluebottles until the audience was half-convinced that he was never going to catch the fly but was laughing anyway and jumpy as a drunk with a glass of milk waiting for him to smack a bare hand into that pile of warm dung.