A lingual frenectomy is a form of frenectomy associated with the tongue.
The removal of the lingual frenulum under the tongue can be accomplished with either frenectomy or frenuloplasty. This is used to treat a tongue tied patient. It is rumored that, immediately after this minor oral surgery, the tongue can often dramatically extend out of the mouth which it could not before do. However the references here measure the difference in "millimeters" and it may actually shorten the tongue, depending on the procedure and aftercare.
Domenico Maceri claims that some South Korean parents have their children undergo frenectomy "which lengthens the tongue by about one millimeter" in the belief they will pronounce English better. Critics regard the surgery as unnecessary, as Koreans born in the United States have no trouble distinctly pronouncing /r/ and /l/. The process has also been used in reverse to aid native English speakers communicate with a native accent. In 2011, Rhiannon Brooksbank-Jones made headlines by obtaining a lingual frenectomy to aid her in speaking the Korean language without the inhibition of an accent.
Frenulectomy is commonly used on newborn infants in the United States and other countries to make breast-feeding more successful and more comfortable. 
This operation is becoming increasingly more common as a voluntary procedure, as anyone wishing to have a tongue piercing, but who has a frenulum that comes too far forward is typically unable to have the piercing. The frenulectomy allows the piercing to be possible.
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- Domenico Marceri, "English in France? Mais Oui!" Seoul Times, 2005. Retrieved 2009-01-227
- Demick, Barbara (2002-04-08). "A snip of the tongue and English is yours!". Los Angeles Times. Archived from the original on 2006-12-10. "doctors say the procedure's popularity has soared ... tongue surgery, which critics say is unnecessary ... Linguists sneer at the idea that South Koreans' tongues are too short to speak English properly ... operation lengthens the tongue by only a millimeter or two"
- Pediatrics In Review, (The Official Journal of the American Academy of Pediatrics), Frenulotomy for Breastfeeding Infants With Ankyloglossia: Effect on Milk Removal and Sucking Mechanism as Imaged by Ultrasound, June 2008 ""