Yes, actually. There are certain mutations in a lickitung’s genetic code that could lead to a tongue being too long for its mouth. You’ll be able to figure out whether or not you have such a case on your hands if the tongue makes it difficult for the lickitung to eat and if the tongue drags on the ground, even if the lickitung corrects its posture and lifts the appendage a little. Such lickitung may even have difficulty breathing, as the tongue’s “root” will also be larger than usual.
In other words, if you notice any of these signs with your lickitung, it’s important to take her to a pokémon center and discuss your options with a Nurse Joy. There are surgeries you can try to reduce the bulk and length of your lickitung’s tongue, but it’s also important to keep in mind that the tongue is a muscle. In other words, surgery, even if it may be necessary for the well-being of your lickitung, will likely require plenty of recovery time. She will most definitely need your support.
If, however, you haven’t noticed your lickitung struggling to eat or breathe, she may be slouching either her back or her tongue (or both). Have her walk with her back straight and her weight leaning against her tail. Get her to lift her chin and stretch her tongue in an arc, rather than straight down. This will pick the tongue up and keep it away from her feet and knees.