Dozens of Hampden residents are challenging their growing taxable value of their homes as the town completes its first reassessment in nearly 35 years. Hampden’s assessor, Rick Thibodeau, has fielded complaints from a few dozen homeowners who are appealing their homes’ new values in recent weeks after reassessment letters were sent to a portion of the town. Despite residents angrily posting on social media about their home values spiking, reacti…