These are the soap two figurines founded by Jem and Scout, and were later re-discovered in Jem's locked chest. When Jem and Scout were walking home one day from school, they looked in the hole of the Radley tree and there were these two figures. The two children were taking guesses of who could've carved the two soap characters. The assumption was pointed towards the Maycomb Phantom, Arthur Boo Radley, because he has taken some sort of liking of the two kids. These were a huge part of the relationship between the kids and Boo because the soap was giving signs to who the gifts and figurines are intended for.