Franklin/WMG

Franklin's parents either inherited, or make their living as gardeners.
Franklin's world is not a cashless society, so unless they inherited, they have to be doing something for work. Yet, no mention of an occupation is ever made and they are actually shown to be at home during the day when Franklin is at school. Since a large amount of that time seems to be spent working in their garden, it makes sense that it is their occupation and those fruits and veggies become food for the stores in Woodland.

In the CGI Franklin and Friends series, it is revealed that Mrs. Turtle sometimes takes substitute-teaching work at Franklin's school. That's income, but it could use supplementing.