Hi my son has just been diagnosed with possible trigger finger, hes 1 month away from turning 2, can he grow out of this and can it be temporary?

Unlikely. Congenital trigger finger, if not resolved by age 2, rarely resolves on its own. This requires surgical release to ensure proper developement of thumb function, which occurs between the ages of 2-3. See a board certified orthopaedic hand surgeon for evaluation and treatment.