The phrase "cinder monkeys" is a colloquial term referring to firefighters. However, if you want to contextualize the phrase or want to avoid using slang, you can use better synonyms to describe these brave individuals. For example, you may refer to them as fire professionals, firefighters, firemen, firewomen, fire responders, or even fire warriors. These synonyms pay tribute to their courage, bravery, and dedication to their duties. Firefighters work tirelessly, risking their lives to protect people and their property from fire and other disasters. Therefore, it is important to recognize and appreciate their valiant efforts by using appropriate and respectful language.