Question about tile

[Bogertophis]

But what if you need to move the tank later? Won't it be too heavy if they're stuck in?

Also, are caulk and grout dangerous at all for the dragon? Like chemical-wise?

You might want to caulk them with aquarium (silicone) sealant, that IS safe & without fumes (also not sticky) once it's dry. But yes, tiles will add weight. Alas, nothing
is perfect.