"...do you eat them..." You can. They're a big squirrel. They eat the same thing cattle eat and are cleaner. Nearly every game cook book has a recipe for ground hog. Most people just stuff 'em back down the hole though.
The fur isn't worth keeping. Too thin. This time of year there's a lot of fat that'd need to be scraped off to tan the hide. Said hide is thin too.
"...look for cattle farms..." Or horses. There will be one main hole with an obvious mound plus at least one hole with no mound away from the main one. These are the holes cattle and horses step in.
"...don't know any farmers or land owners..." Most of the land around you is owned by TO commuters. They may or may not let you shoot there. However, knocking on some doors and politely asking might get you onto a farm. Don't go on Sunday. Don't take a firearm and if the guy says no, thank him and leave. It doesn't hurt to ask if he knows anybody who might let you hunt on their land though.
Ground hogs are one of the few beasties that actually hibernate. They'll be undergound for the winter soon. Cattlemen might let you hunt coyotes during the winter if you ask nicely though.
KFN & Metroplis 
