Carrots - my russkies are crazy for carrots. Grate some over better foods like greens or weeds.

Dandelion flowers - if you have any this time of year.

Yellow squash.

Hibiscus flowers - if you can get them without any chemicals.

Clover flowers - both pink and white.

Be sure to keep him at optimal temperatures.

See www.russiantortoise.net for more info.