Most plants love the humidity and ambient temps of our enclosures. The problem is the lighting. You need plants that do well in lower lighting and place them to where they are not directly under a CHE or basking light as they will burn.
I have best results with ( in the order of how well they do for me best to medium)
Pothos Ivy
Boston Fern
Spider Plant
Prayer Plant
Coleus
None of those plants will create a problem if the tortoise nibbles on what it can reach. Certainly not a food staple, but fine for taking bites as the plant grows.