That's the voice of Olan Soule. In this series, Larry Storch did the voice of the Joker and Ted Knight was the narrator (and of course that's Casey Kasem as Robin), but there's no word on who voiced the Scarecrow.
I'm thinking robbing a farmer's market would be a huge pain in the ass. It's not like they have a big safe where they store all the most valuable pumpkins or something. You'd have to go from vendor to vendor, and by the time you're done explaining the concept of the robbery for the ninth time to the hard-of-hearing 85 year old lady who makes the fine jams and preserves, the cops will be there.