godan verb (-ru)
chirp incessantly; buzz constantly
Describes insects or birds making continuous, often loud, sounds. The verb しきる adds the nuance of doing something persistently or without stopping.
夏の夜、セミが鳴き頻っている。
On summer nights, the cicadas are chirping incessantly.
朝から小鳥が鳴き頻って、とてもにぎやかだ。
Since morning, the small birds have been chirping constantly; it's very lively.