Hobo's warning sign of Mimic??

When the 2 kids got scary as they open up trash bags which turn out it was homeless to use to sleep in. As the boy left and make the comments while give the "Middle Finger". As the camera turn on 2 kid's back, for few second, I happened to noticed on the right side of screen, on gray cements wall, there were white chalk of Man-looking like wearing hat with wing shape on body (board shoulder become slim on way down to bottom). Is that the warning sign of Mimic up ahead which were designed by Hobo? After kids pass the wall, they found eggs and mimic eat dog.

I thought that kinda interesting because I learn back in school that hobo used to draw on wall to warning other hobo that there's danger up ahead, good food service, place to sleep, and so on.