This is an infant's first toy and it's an amulet called a Piikstaan. An amulet like this one would often be created by Blackfoot women to give to their child. It's also known as has a nothing face.
A 19th century prayer book written by Edward M. Griva, S.J., featuring prayers as well as catechism (questions and answers regarding the Christian faith) in the Kutenai language with English translations in red ink underneath.