" 'Hello Jack Frost,' he said "
Jack Frost is a figure from English folklore, the personification of ice and frost.
" Jack Dandy's smile grew wider "
Jack-a-dandy, a variation upon "dandy
", is a contemptuous name for a male who is overly concerned with his appearance and dress. It was commonplace from the mid-sixteenth to the mid-nineteenth centuries.
It is also the name of a character in a comic book written by Alan Moore, one of Neil Gaiman's literary influences.
" Jack Ketch, with a twitch of his moustache "
Jack Ketch was a famous seventeenth century hangman, whose name became a nickname for all hangmen and, by extension, a euphemism for death, particularly by hanging.
" 'The boy?' asked the Jack called Nimble "
Jack Be Nimble
is an old English nursery rhyme:
Jack be nimble,
Jack be quick,
Jack jump over