Final answer:
In the book 'To Kill a Mockingbird', the second 'gift' that Jem and Scout found in the tree was a pair of soap figures shaped like them, left by their neighbor Boo Radley.
Step-by-step explanation:
The second "gift" that Jem and Scout found in the tree in the book 'To Kill a Mockingbird' by Harper Lee was a pair of soap figures shaped like them. They discovered the figures after finding a ball of gray twine, and later found a watch and chain too. The gifts were left by Boo Radley, their mysterious neighbor who rarely left his house.