Read "Six-Foot Tiger, Three-Foot Cage" https://www.amazon.com/dp/B06X9ZDHTT/ref=dp-kindle-redirect?_encoding=UTF8&btkr=1   Althouh I haven't read it, I'm almost 100% confident that the tongue is supposed to not be too large.

Tongue chewing, tongue push ups

/community/community/main-forum/tongue-strengthening-exercises/

^Myofunctional exercises^

/community/community/main-forum/opinion-on-tongue-tie-surgery/#post-7571

^Tongue stretches/exercises^

https://ronaldead.com/blog/2018/3/15/anterior-growth-guidance-appliance-faqs

"Currently my favorite tongue exercise is to take a 1.5lb wrist weight and pull a handkerchief through it. Then I place the ends of the handkerchief into my mouth and hold the weight by pressing the handkerchief into my maxilla using my tongue.

I will do this for a few minutes at a time while driving, then take a break, then do a few more minutes. On and off for the whole drive.

This exercise has been a game changer.

I also attach a handkerchief to a wall-mounted elastic exercise band, hold the handkerchief by pressing it between my tongue and palate, and then do various neck twists or just move my body back so that there is tension on the band, and then hold posture for as long as I can.

Got to be careful not to break the appliance while doing this though.

I hope this doesn't sound insane. It was heavyweight boxer Joshua Anthony's idea!"

^From Ronald Ead, popular AGGA patient, do at your own discretion^

Also just maintaining tongue posture and swallowing properly should strengthen the tongue.