Matilda has been travelling abroad with her family, but now she's back in Australia, staying on her cousin Emily's farm. Matilda loves spending time with the animals, her cousin Emily and her friends Amy, Jasmine and Bronte (even if she's a bit shy around them after being away for so long). She especially loves going to the creek and watching the frogs. There is one little froglet she likes in particular. She calls him Peep because of the funny little noise he makes. One day, Emily brings Matilda a present. She unearthed an old tin containing a leather pouch and a beautiful Chinese comb. Where did they come from? Why were they left on Emily's farm? Emily knows that Matilda loves history and research almost as much as she loves frogs! So she sets her cousin the task of finding out.

While Matilda's in the station library researching, her friend Jasmine offers to help, but first, they have to get cheeky Peep--who has stowed away in Matilda's jumper--back to his home in the creek. On their way there, Peep escapes! As they search for him in a cave, they discover an old journal. Could this hold the answers to where the mysterious comb and pouch came from? Matilda's Frog Troubleis a story about history and about friendship--between people from far-off lands and girls who seem different at first, but are really quite alike--and about the importance of looking after our precious wildlife.