Frogs belong to aquatic products and are kept in ponds. If you buy a pond in decoration-ground paving, you can buy it at grade 2 1 (if you take F coins, there is no grade limit). Just like farmland, it can be spread on the ground when bought back, and each pond can raise an aquatic product.

Aquatic products are ... very troublesome to collect. Every time you order them, your little people will run around the pond, wasting time.