Yes as a matter of fact during the Elizabethan era the art of breeding fine guinea pigs for mowing lawns was a respected profession and continues in some areas of the world today.
no sorry. they usually kept the lawn in order by methods of scything and shearing. they also used different kinds of livestock and had them graze there, but sorry, no guinea pigs.
They didn't even have a lawn for crying out loud. They had moats!
In Tudor times, they used sheep to mow lawns.