The Mobile Sprout is just a big walking sprout. They are usually green, but the other forms, such as the Tough Mobile Sprout, are different colors.
These monsters are basically green sprouts with legs. They are not very strong, but can give a lot of EXP in the beginning of the game. The Tough Mobile Sprout is also a sprout with legs, but it is gray. They can both provide great EXP, and are generally located in the Your Sanctuary locations.
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