The man who gave his name to swapped-sound slips may have made only one or two of them himself.
William Archibald Spooner spent more than 60 years at New College, Oxford, starting as an undergraduate in 1862. He became a fellow, served as dean, and was warden from 1903 to 1924. He lectured on ancient history, divinity and philosophy. Wikipedia quotes a description of him as an albino, small, with a pink face, poor eyesight and a head too large for his body.
He also gained a reputation for transposing the opening sounds of words. By May 1895, according to Word Histories, a Devon newspaper reported that his habit had "given rise to the word 'Spoonerism.'"
The famous examples are the problem. Lines like "a well-boiled icicle" for "a well-oiled bicycle" are almost certainly not his. Wikipedia notes that the Oxford Dictionary of Quotations accepts only one as substantiated: "The weight of rages will press hard upon the employer," meaning the rate of wages. In a 1928 interview, Spooner admitted to one more. Announcing a hymn from the pulpit in 1879, he said "Kinkering Congs Their Titles Take" instead of "Conquering Kings."
Most of the rest were manufactured by students and colleagues for fun. Wikipedia cites a 1928 New York Times report that they were "principally invented by" a former student, Robert Seton. Word Histories quotes a 1930 newspaper claim that Spooner made "only one" in his life.
He did not enjoy the fame. Phrase Finder tells how undergraduates at a college dinner for his retirement asked him for a spoonerism. He stood up and said, "You want me to say one of those things; but I shan't," then sat down. Maurice Bowra, another New College student, noted that he was sensitive about the subject.
The slip itself is much older than the word. The French writer Rabelais played with swapped sounds in the 16th century, a form the French call contrepèterie. An older English name, "marrowsky," is supposedly taken from a Polish count with the same habit. Spooner's name simply stuck, whether or not he earned it.