Sometimes... sort of...Do you recommend they eat timothy hay?
Your species is not a grass eating species, so no, normally I would not say to feed them grass or grass hay. However, soaked Timothy hay pellets are a great way to add some fiber to any tortoise's diet, including species that are not grass eaters.
I would start with one tiny pellet. Soak it in a bottle cap and then mix it in with the day's greens. When the tortoise is eating all the greens with our little hidden "crumbs" stuck to it, you can start adding a little more in gradual steps.
I use these Timothy hay horse pellets almost daily for all my species when I'm forced to feed grocery store greens due to lack of anything else. Along with the offerings from Will and Tyler, plus some Mazuri and ZooMed pellets, they get a nice variety and get their nutritional needs met.