ditch digger, mud digger - a laborer who digs ditches

laborer, labourer, manual laborer, jack - someone who works with their hands; someone engaged in manual labor

trencher - someone who digs trenches

backhoe - an excavator whose shovel bucket is attached to a hinged boom and is drawn backward to move earth

dredge - a power shovel to remove material from a channel or riverbed

machine - any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks

steam shovel - a power shovel that is driven by steam