Girl scouts (and girl guides) often have patches to commemorate a fun event. The ones they earn for work go on the front of their vest and have specific criteria for earning them, but are usually more generic in appearance or don’t have details about it on the patch.
This type of patch is likely for the youngest age group (4-5) and is meant to be more of a fun patch. I would also guess that the troop is in more of an urban area so there’s not much in the way of a very local, small kid friendly hike.
I found a page about how to run the activity and I think it’s a pretty nice idea for a younger or multi-level troop: https://www.scouts.org.uk/activities/chippy-hike/