Thanks, all, for the further information.

Martin, what was the fellmonger selling? I thought a fell was some kind of landform.

Michael, a coffee shop would be a coffeemonger. A coffeecosta would be a place that either:

puts ribs in your coffee - an unlikely proposition, or
sells coffee and ribs - i.e., a barbecue joint.

I had forgotten that Molly Malone was a fishmonger. My unabridged dictionary listed maybe 60 words ending in 'monger,' some of them pretty odd. What might a punctiliomonger be?