muckworm

muck·worm

 (mŭk′wûrm′)
n.
Any wormlike insect larva, as of certain beetles, that lives and grows in manure.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

muckworm

(ˈmʌkˌwɜːm)
n
1. (Zoology) any larva or worm that lives in mud
2. informal a miser
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
Let's put it this way: For all the names I found for these marine worms, I didn't find any references to them being called "muckworms." Finding specific habitat requirements for the clam worms has been almost impossible (since nobody can usually identify exactly what the worm is), but other information about the lifecycle of clam worms suggest that quality habitat is critical.