The phrase "a plump man" is correct and can be used in written English.
It is a descriptive phrase that can be used to identify or describe a man who is overweight or has a round, full figure. It can be used in various contexts, such as in literature, description, or dialogue. Example: The bustling marketplace was filled with all sorts of characters, but one in particular caught my eye - a plump man with a round face and a jovial expression, handing out samples of his delicious pastries to passersby.
Mr. Diamond, known as Tunnel Bob, is a plump man who lives in Kensington, Brooklyn.
A plump man of 50, with an infectious schoolboy laugh, he was delighted at the American scene.
A plump man slept in his chair in the back room, his Beethovenian head a tempest of silver locks.
One was a plump man with creamy blond hair, who looked to be in his early seventies, and who was known to barflies as the Sailor.
A plump man in a neighborhood of the half-starved, he wore flashy shirts and hooked up his friends with catering jobs at weddings.
Some targets depict enemies — they have angry frowns and wear turbans and look like Khomeini — and some depict civilians: boys in blue-striped polo shirts, little girls in dresses, and a plump man in a button-down shirt.
He presented Blaine as "The Tattooed Man" a plump gentleman in shorts, tattooed all over the arms, legs, and torso with scandals, such as "Dodger," with reference to Blaine's war experience, "Guano" and "Mulligan Letters".
He is a short, plump man with a mustache, who walks with the darting movements of a bantam cock and has a remarkably high voice, almost like a woman's, which at moments of excitement rises to the falsetto of a phonograph record played at the wrong speed.
Syrnikov — whose preferred version of solyanka comprises layers of shredded, smoked, and boiled beef alternating with braised sour cabbage, all doused in beef stock — is a short, plump man in his forties with the ruddy face of a benevolent village matron.
Mr. Li alternated with a short, plump man named Mr. Liu.
A short plump man missing half his teeth approached the counter to speak with Mr. Allai, the Santería priest.
