Final answer:
In 'Into the Wild' by Jon Krakauer, Chris McCandless fondly referred to Ron Franz as "Grandpa."
Step-by-step explanation:
In Jon Krakauer's Into the Wild, Chris McCandless called Franz "Grandpa." McCandless developed a close friendship with an eighty-one-year-old man named Ron Franz while journeying to Alaska. The two shared a deep connection, and McCandless's influence led Franz to reevaluate his life and embrace new adventures, akin to the way that Henry David Thoreau's philosophy in Walden encouraged self-reliance and nonconformity.