Besides these, there were the mudlark and the scupple hunter: the former prowling about at low water, receiving in his small bag such petty packages as he could get from his dishonest friends on board; and the later sneaking about the wharves and quays, under the pretense of wanting work, to pick up everything and anything that came to hand.
Source: wiktionary
She removes only what the water ‘delivers’ to her – items she can see lying on the surface. Unlike some other mudlarks, she does not dig for finds.
Source: wiktionary
Dr. Fiona Haughey, a London archaeologist who has worked on the Thames since the 1990s, said that although some mudlarks are looking for valuables, others are looking for a connection with the everyday objects of a bygone Britain.
Source: wiktionary
the children were nothing like inert: a large population of junior mudlarks, so long unwashed that you could hardly make them out, climbed among the ruins, cheerfully playing the games that all children play – pushing wheels with sticks, flipping rusty lids and bottle caps in makeshift tiddlywinks.
Source: wiktionary