a frenulum is in the back while the tongue tie is in the frontI have never known about it. I don't know what is a frenulum or a tongue tie. I guess it's a frenulum, it does not restrict anything.
According to this: https://my.clevelandclinic.org/health/body/frenum-mouth-frenulum there are a number of frenulum. Whatever.a frenulum is in the back while the tongue tie is in the front