Can you get charged for pawning a lawn mower that you found in your lawn but didn't know it was stolen?

Based upon what you are saying, doubtful you will be charged.

There are criteria to determining whether property is abandoned. Given the circumstances that you are describing, it was reasonable to believe that the lawnmower was placed there because it was stolen, thus it should have been reported. However, it was not out of question to believe the lawnmower was simply abandoned there. In court, it will be your responsibility, or the responsibility of the lawyer, that you lacked the necessary motivation and/or intent to carry out a theft.

In Georgia, there is a criminal charge called "Theft of Lost or Mislaid Property", which seems to apply to your situation. You could be charged, and at least have to pay restitution to the pawn company. With this kind of crime, the standard used is not whether or not you actually knew that the lawn mower was stolen, but SHOULD you have known that someone probably didn't just leave a lawn mower just sitting in the road for anyone to take. If you have never been arrested before, or have a minor criminal record, the District Attorney may be willing to give you a break. I always recommend that someone at least talk to an attorney in person, because most criminal defense attorneys will give you a free consultation. Good luck.