#nob# is _knob_. Golden-nob is 'a variety of apple'; see _E.D.D._:
and as a special name, which the passage implies, it should be hyphened.
6. 'where the pollards frown,
Notched, dumb, surly images of pain'. (13)
#Notched.# This word well describes the appearance of old pollard
willows after they have been cropped; but its full propriety may escape
notice. A very early use of the verb _to notch_ was to cut or crop the
hair roughly, and _notched_ was so used. The Oxford Dictionary quotes
Lamb, 'a notched and cropt scrivener'. Then _pollard_ itself is from
_poll_, and means an animal that has lost its horns as well as a tree
that has been 'pollarded'.