“the authors concluded that the juvenile ages of common chameleon exhibited the characteristic feature of the developing tongue system which is adapted for capturing prey coincides with glandular structure of fore-tongue, pattern of lingual papillae and stem cell contents.”…
https://www.sciencedirect.com/science/article/pii/S2314808X16301920
https://www.sciencedirect.com/science/article/pii/S2314808X16301920