I Read a Book, but Now I Forgot the Title and Can't Find It

It's a fast time travel, in which one of the main characters in the world turns into something like a traveling frog, but the others are frogs, and she is a panda. She became a man's pet and brought back mermaids and dragons from her travels to help make money. Before leaving the plane, he snatched the frog of the male protagonist from the original world and gave it to his master.