Most varieties of mint and bee balm are fine, but keepers generally avoid catnip since it does contain some compounds that can have unpredictable effects (cats, forex, can become happy or aggressive).
I wouldn't make a whole meal of something so strongly flavored, but it makes a fun and interesting part of a varied and balanced diet.
You will find a lot of information about Russians here:
Common Name: Mint (Garden Mint, Spearmint, Apple Mint)
Latin Name:Mentha sachalinensis; M. spicata, M. sauveolens
Family Name: Lamiaceae/Labiatae
These are fine to plant in the tortoise enclosure and will do no harm if nibbled, although some tortoises will be put off by the strong aroma.
Do not confuse these mints with Peppermint (Mentha piperita), Pennyroyal (Mentha pulegium) or Purple Mint(Perilla), which also belong to the Lamiaceae family but are not safe to feed. Garden Mint (Mentha sachalinensis)
Spearmint (Mentha spicata)
Applemint (Mentha suaveolens)