I think the Scots words are pretty much shared with all the Scots dialects Catriona and arguably Glaswegian is one of the less conservative Scots speaking areas so not that likely to use many older words not known in other areas like the north-east or Borders etc. Callant though not nowadays an everyday word is still a pretty well known word down here in the Borders especially I suppose because of the riding festivals. The Jedburgh festival is actually called Jedburgh Callant's Festival and the principle is called The Jethart Callant. The word appears in other well known songs too. Straight of my head from Hamish Henderson's "Freedom Come All Ye"

"Nae mair will the bonnie callants
Mairch tae war when our braggarts crousely craw"