Farmer is a compound sign: first, sign farm, then sign the agent marker to signify a person. To sign farm, form the ASL number 5 sign with your dominant hand, and starting with your thumb touching your opposite cheek, trace your jaw going from the non-dominant side to the dominant side of your face.
Finish off by signing the person or agent marker, holding both flat, open hands in front of your body with palms facing each other, then sliding both parallel hands downward.
Many children are interested in different types of people and jobs. Teach farmer alongside other occupation signs, like teacher and firefighter.
Teach this sign along with the other flash cards pertaining to planting, harvesting, and farm animal flash cards.