A human miner, Charles Brown, grew and tended a huge pumpkin patch in his backyard.
Charles also dug into the earth in his backyard, determined to find buried treasure. After spending several decades working at a local mineshaft while creating a network of deep tunnels underneath his backyards, he knew he was nearing the end of his years being able to continue mining. He had not found the treasure he has never doubted is buried somewhere beneath his pumpkin patch. Thinking ahead he made a deal with his best friend from childhood, Linus, who had become a reclusive druid - create a creature from his pumpkin patch that could continue on digging for the treasure he is certain is buried somewhere beneath his pumpkin patch and he will tithe ten percent of the wealth he finds to combat natural wildfires. Linus accepted the deal. Part of the ritual Linus did animated not just Jack (created from a pumpkin (for the head) and vines for the new leshy's body and limbs), but the ritual also animated a bunch of additional pumpkin vines into a sentient tumble ball of vines, that were linked to Jack. Jack dug alongside his 'father', Charles for five years, then continued to dig for the next 20 years after Charles was no longer physically able to mine. When Charles life ended of natural causes, Linus buried him in his pumpkin patch and told Jack it was time for him to make his own way in the world.
Charles and Jack never did find the buried treasure that Charles was confident was buried somewhere under his pumpkin patch.
After Charles was buried, Linus told Jack that he thinks Charles misunderstood a seer's prophecy from when they were wee lads - the fortune teller had told Charles, "You will find treasure in a pumpkin patch you care for."
Linus told Jack, "You were his treasure, Jack."
Jack stayed with Linus for a year before begining his adventures. During the year he lived with Linus, the druid taught Jack abouut the pantheons Gozreh is a god of. Jack liked the The Endless Road the most.
Before Jack set off to see the world, he traded his pick for a sickle and dagger.
Linus gave Jack two parting gifts. A wooden religious symbol of Gozreh and a religious text about The Endless Road pantheon.
Jack discovered he has a knack for map making.
For the last few weeks he has been making maps while exploring Dunmire.