I am sure there are plenty. Songs for, by and about hobos and tramps and in some cases migrant workers come to mind.

From wikipedia

Songs
Musicians known for hobo songs include Ramblin' Jack Elliott, Utah Phillips, Jimmie Rodgers, Seasick Steve, and Boxcar Willie.

Examples of hobo songs include:

"Big Rock Candy Mountain" by Harry McClintock, recorded by various artists including Tom Waits, Lisa Loeb, The Restarts and Harry Dean Stanton.
"Hallelujah, I'm a Bum" recorded by Harry McClintock, Al Jolson, and others
"Hard Travelin'" and "Hobo's Lullaby" by Woody Guthrie
Here Comes Your Man by the Pixies is about hobos travelling on trains in California and dying because of earthquakes.[22]
"Hobo" by The Hackensaw Boys
"Hobo Bill", "I Ain't Got No Home" and "Mysteries of a Hobo's Life" by Cisco Houston
"Hobo Bill's Last Ride" by Jimmy Rogers, also recorded by Manfred Mann's Earth Band
"Hobo Blues" and "The Hobo" by John Lee Hooker
"Hobo Chang Ba" by Captain Beefheart
"Hobo Flats" by Oliver Nelson
"Hobo Jungle" by The Band
"Hobo Kinda Man" by Lynyrd Skynyrd
"The Hobo Song" by John Prine also covered by Johnny Cash
"Hobo's Lullaby" (aka "Weary Hobo"), written by Goebel Reeves, recorded by various artists including Woody Guthrie, Arlo Guthrie, Emmylou Harris, Pete Seeger, The Kingston Trio, and Ramblin' Jack Eliot
"Hobos on Parade" by Shannon Wright
"I Am a Lonesome Hobo", "Only a Hobo" and "Ramblin' Gamblin' Willie" by Bob Dylan
"Jack Straw" by Robert Hunter and Bob Weir
"Jesus' Blood Never Failed Me Yet" a recording of a hobo singing on a London street, by composer Gavin Bryars.
"King of the Road" by Roger Miller
"Kulkurin Valssi" (Hobo Waltz) by Arthur Kylander
"Lännen lokari" (Western Logger) by Hiski Salomaa
"Last of the Hobo Kings" by Mary Gauthier
"Like a Hobo" by Charlie Winston
"Mary Lane" by Fred Eaglesmith
"Morning Glory" by Tim Buckley lyrics by Larry Beckett
"Papa Hobo" and "Hobo's Blues" by Paul Simon
"Ramblin' Man" by Hank Williams Sr.
"Streets of London" by Ralph McTell
"Waiting for a Train" by Jimmie Rodgers
"Hopscotch Willie" by Stephen Malkmus