The phrase "a chubby man" is correct and usable in written English.
It can be used to describe a man who is somewhat overweight or has a round physique in a neutral or descriptive context.
Example: "At the park, I noticed a chubby man feeding the ducks by the pond."
Alternatives: "a plump man" or "a stout man".
(Liebling described Long as a "chubby man" with ginger hair and skin "the color of a sunburn coming on").
A chubby man in his forties was pounding a sheet of paper laid on a pillow.
In the production office, I spy a chubby man gathering up a dozen DVD's and videos in his arms.
A chubby man, he had ginger hair, and tight skin that was the color of a sunburn coming on.
It was the quintessential theme park scene: tourists chattering noisily, a chubby man digging through his fanny pack, boys using the railings as a swing set.
I sat in the row behind Yao, beside a chubby man in his forties named Zhang Guojun, who had flown to Harbin to watch the game.
I'd done it again; I'd clicked myself into oblivion and here I was watching a video of a chubby man-child lolling about on his sofa, his life made hilariously difficult by the contraptions he'd had installed to enable his laziness.
The two proprietors are Manolo, a mousy guy who works as a graphic designer, and Victor, a bald, chubby man who is a forensic M.D.
They watched a shirtless, chubby man offer a short prayer to Buddha.
The best has to be at the end of a paragraph describing crossing from Malawi into Zimbabwe via Mozambique: "There was nobody at the Mozambican immigration office except a boy with one leg selling roasted birds and a sweaty, chubby man who walked on to the bus and collected our passports together with a fee..
Just a slightly chubby man in his pajamas, standing on his lawn in the middle of the night, staring at the neighbors' window.
