What is the origin of the idiom "eat the frog" and when to use it?

The phrase "eat the frog" is often attributed to Brian Tracy, a well-known author and motivational speaker, who popularized it in his book titled "Eat That Frog". The exact origin of the expression is unclear beyond its association with Tracy's book, as it is likely a metaphorical concept that has been used in various forms throughout history to emphasize the importance of tackling challenging tasks promptly. This expression is often used in professional settings to promote effective task prioritization and goal attainment. It is applicable in situations where individuals have a list of tasks to complete but may feel overwhelmed or tempted to procrastinate.