https://www.scientificamerican.com/article/t-rex-couldnt-stick-out-its-tongue/

T. rex may have been a highly successful predator, but it would have been terrible at licking stamps, lollipops or popsicles, thanks to a tongue that was likely fixed to the bottom of its mouth.

A new study calls into question artists’ renditions of T. rex and other dinosaurs that show them with their tongues protruding from gaping jaws—a pose that is commonly seen in modern lizards. But even though lizards are tops at tongue waving, dinosaurs probably couldn’t stick out their tongues, researchers recently discovered.