Thoughts on how I can make money as a kid in a pandemic?
Your ideas look like a good start!
Other things I can think of:
Some parents pay kids for good grades.
Some relatives give money at birthdays and Christmas.
Mow lawns, rake leaves, shovel snow (all are outdoors, so probably reasonable even during a pandemic.)
Help other kids with their schoolwork (tutoring): either siblings or online. (Only works if you know more than the students about the subjects in question.)
Definitely do not neglect your own schoolwork and chores-- you do not want your parents getting rid of the chickens because you are too busy working to earn money!
Do your parents buy the chicken food, or do you need to budget for that too?
If the rental chickens get returned, you would have the option to save up the money BEFORE getting the coop, instead of paying it back after. That might be a more comfortable situation. (I recognize that if you keep the rental chickens, they need a suitable coop before the weather gets bad this winter. But do think about the benefits of being chicken-less while saving up money for the coop.)