Maximum value determines the amount of XP (experience points) that is earned when a frog is tamed. XP earned is calculated at 10% of maximum value (rounded down to the nearest XP). For example, if a frog is worth 726 coins at maximum value then the player will earn 72 XP upon taming the frog.
The maximum value of a frog contributes to the cost of breeding with that frog (half of the average of the maximum values of the two parent frogs).
The Pocket Frogs Database is a Google Sheets document containing the values and racing statistics for all possible frogs in the game. This document has been updated for the new values in version 3.x of the game.