A large variety of suffixes were used to form diminutives in English. The Wikipedia page on diminutives shows these:
* -k/-ock/-uck: balk, bollock, bullock, buttock, fetlock, folk, hark, hillock, jerk, mark, mattock (OE mattuc), milk, mullock, pillock, smirk, snack, spark, stalk, talk, whelk, work, yolk
* -n/-en/-on (accusative or feminine): burden, chicken, even, heaven (OE heofon), kitten, maiden, morn, oven, steven, vixen, weapon (OE wæpen)
* -le (defrequentative -l): beetle, boodle, chortle, doodle (shares root with dude, P doudo, dolt, dull, dote, dotterel), fizzle, giggle, kibble, little, mickle, noodle, oodle, puddle, riddle, sparkle
* -ish (disparative): boyish, fiftyish, girlish, largish, mannish, noonish, reddish, smallish, tallish, twelveish, womanish
* -s (degenitive): Becks, Betts, Wills
* -sie/-sies/-sy (babytalk assimilative or from patrici- of Patsy): bitsy, footsie (1930), halfsies, onesies, popsy (1860), teensy-weensy, tootsie (1854), twosies, Betsy, Patsy, Robsy
* -o (American devocative, later Commonwealth): bucko, daddio, garbo, kiddo, smoko, wacko, Jacko, Ricko,
* -er/-ers/-ster (agentive, intensive, hýpocoristic, also elided hrotic -a): bonkers (1948), preggers (1940), starkers (1905), Becker[s], Lizzers, Hankster, Patster
* -a (Geordie assimilative -er): Gazza, Macca
* -z (geordie degenitive -s): Bez, Chaz, Gaz
That same page also contains a list of suffixes of diminutive loanwords, such as:
* -ling (Norse defrequentative-patrinominative): darling, duckling, fingerling, gosling, underling
The suffix -ling, for example, was used to form the following words:
darling = dear + ling
sterling = star + ling (from the small star stamped on the coin)
shilling = shield + ling (?)
Most of the words shown above are old words that have been used for centuries. Are there any more recent English words (let's say, from the past few decades) that have been formed with diminutive suffixes? If yes, which words and suffixes are those?