mudlark

1. A pig; pork.
2. One who scavenges in river or harbor mud for items of value, especially in London.
3. A child who plays in the mud; a child that spends most of its time in the streets, a street urchin.
4. A soldier of the Royal Engineers.
5. Any of various birds that are found in muddy places or build their nests with mud, especially Anthus petrosus and Alauda arvensis.
6. The Grallina cyanoleuca that builds its nest with mud into a bowl-like shape.
7. A racehorse that performs well on muddy or wet tracks.

verb

To scavenge in river or harbor mud for items of value.