For the filling: Add the peanut butter, cocoa powder, honey, cinnamon sugar and avocado to a food processor and blend on high until smooth and aerated. Scoop into a piping bag or sealable plastic bag. Refrigerate for 10 to 15 minutes.
For the logs and insects: Choose a tip for piping or cut a hole in the corner of the plastic bag. Place the celery leaves in the recess of the celery stalks and pipe the filling over them, leaving a bit of the leaves sticking up on the sides of each. Top with one of each "insect"--a raspberry, raisin, dried cherry and pretzel--along the length or make logs to your liking.