The retired Puzzler badge is a great one to earn for your Junior troop. It is relatively inexpensive to prep for and can be structured to allow the girls to work pretty independently.
Here’s a complete list of retired junior badges, so you can decide which ones are appropriate to reintroduce into your troop, if you can find them.
The Girl Scout Bronze Award is the highest honor your Juniors can ear. Get your girls brainstorming with this list of ideas.