Money frog represents a popular Feng Shui charm for prosperity. ... Because it symbolizes the flow of money, Feng Shui lore insists that a money frog statue with coin in mouth should not be positioned facing the main door outward. It also should never be kept in, near or towards the bathroom.
why the frog?
it is becouse oh that Frog's tongues are attached to the front of their mouths so When a it catches an insect it throws its sticky tongue out of it's mouth and wraps it around its prey, subconsciously it catches your dreams and good wealth.