The phrase "growing frantic" is grammatically correct and can be used in written English.
Example: As she waited for her test results, Sarah felt her anxiety growing frantic.
DAMASCUS, Syria — Rifa was growing frantic.
Growing frantic, Ms. Kelly found the Hotel Alexander on West 94th Street, an extended-stay hotel.
The Case At the county jail, Ms. Hurell-Harring was growing frantic as she waited nearly a month for her sentencing.
I was in no hurry, but Maggie, who had signed the book many times over the years, was growing frantic about being late to Glin.
His wife grew frantic over his affairs.
During filming, the pace grows frantic and often improvisational.
When you wander endlessly in the wilderness, you might grow frantic looking for a savior.
Madness was stoic; Yul, whose nickname came from his shaved head, grew frantic as he talked.
But Castelli's anxiety to corral the spread of artistic novelties, including the newfangled medium of video, grew frantic.
A few weeks before I was to return to Connecticut and college, I grew frantic about finding something to leave Bouchara.
