Here's a bit of info:
"Money Frog (also called Three Legged Toad or Frog or 'Chan Chu') is
the most significant symbol of prosperity in Feng Shui. It is linked
to the moon due to its transformation during the phases of the moon,
associated with monetary gain, wealth and good health. Chinese legends
had said Money Frog was the wife of one of the the Eight Immortals.
She was being punished for stealing the peach from the heaven. She
craves for money and wherever people see a Three Legged Frog, there is
a bed of money surrounding it. For generations since ancient China,
this mythical Money Frog is one of the five chinese holy creatures
that protects us against misfortune and brings to our household bigger
enrichment in wealth. We're talking about creating abundance in wealth
for serious Feng Shui practitioners.
Traditionally, the Money Frog is usually depicted holding a Ching
Dynasty coin in its mouth and sitting on lots of gold ingots, coins
and wealth. To make the symbol more powerful, a good Money Frog will
have a throne on its head to signify its authority of creating wealth.
Besides, a bagua would also be carved on its back to protect against
loss of money that had been gained. To enhance it even more, a better
Money Frog would also carry strings of chinese coins tied behind its
back... there are 7 dots of stars to represent 7 Great North Pole
stars of the bagua, which fundamentally triggered the study of Feng
Shui in ancient China."