The phrase "become stout" is grammatically correct and can be used in written English.
It means to become physically or figuratively strong or resilient. Example: "She started going to the gym regularly and gradually became stout, able to lift heavy weights and run long distances without getting tired."
Exact(1)
All the bodies had swollen to become stout and plump, and the smell of death floated over the rancid stench of decomposing rubbish.
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Atlanta -- which had a game-winning pick-six against Washington in Week 5 -- currently ranks 15th in points allowed and has become the stoutest unit in the league against the run, ranking first in rushing yards allowed per game.
Probably under the influence of Archbishop Wulfstan he became a stout supporter of the church, which in his reign had the vitality to engage in missionary work in Scandinavia.
Nowadays, as Americans have become accustomed to stouts, trappist ales, porters and all manner of dark brews, the talismanic appeal of Shiner Bock seems somewhat quaint.
This same beer later also became known as stout, though the word stout had been used as early as 1677.
That doesn't mean that stout becomes wimpy, though.
What attracted Amber Reeves and Rebecca West and so many others was not Wells's physical presence — a malnourished childhood had left him short and slight, until he became short and stout with age — but what he represented.
Stout became the de facto leader of the unlikely band of art heroes who braved battle to help save Europe's cultural patrimony.
Instead of majestic towers and merlons, the walls of new fortresses were thick, angled, and sloped, while towers became low and stout; increasing use was also made of earth and brick in breastworks and redoubts.
A pseudo-holiday concocted by Guinness in 2009 to celebrate its founder and stout, it's actually become something of an occasion in Ireland.
Instead of majestic towers and merlons, the walls of new fortresses were thicker, angulated, and sloped, while towers became lower and stouter; increasing use was also made of earthen, brick, and stone breastworks and redoubts.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com