Absolutly yes, for example the Asmalat Ovrir (Book) that you can found in the royal archives of Thais and say
"Asmalat ovrir gogenol amabat hulut a sese sokol. Gogenol faresmal a sese ican."
And looks like a code right?, well it is like the 99% of tibia and there is a consensus with this book that say
"... Look to Alistair grave
Name of Hellgate language
Use Solomon sarcasm as base..."
SO we have aloooooooooooooot of possibilities here, Alistair can refers to Alister Cropwell a npc in tibia that refers to a Alister Crowley and he was a occultist who liked to write messages in code
And "Name of hellgate language" obviously means Bonelord languaje "469"
and for the last "Use Solomon sarcasm as a base", well Solomon was a real life mage/occultist of (965-928 AC) who wrote a VERY curius book named "solomon's clavicles" with ALOT of spells and things of demons so WHO KNOWS, in this book can be the missing piece of the bonelord language heheh