I am doing research on frogs and need the following information to continue?

What is the name of the circular side head of the frogs who are listening structures but have a specific name? What is the name and the benefits of the structures? Why frogs not only have regular, prominent ears like most other animals? What is the name of the double lines that flank both sides of the frogs again, that goes from head to rump? What is the function of these lines?

The circle is the tympanic membrane. The lines are dorsolateral folds.

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