Team Logo. The Joliet Jackhammers were a team in the Northern League. They only made the playoffs twice in their 9 years in the league. In 2011 they moved to the Frontier League and became the Joliet Slammers. Retrieved from "https://prosportsteams.fandom.com/wiki/Joliet_Jackhammers?oldid=12577" Categories: Northern League Teams Teams in Illinois Community content is available under CC-BY-SA unless otherwise noted.