That's a jade plant. I sometimes offer it to my sulcatas, though to be honest, they aren't very enthusiastic about eating it. Just an occasional bite will be taken off the leaf. As for red foots, I'm not sure, a) that its something to offer, and b) that they'll eat it. I'll check some rescorces and get back to you.
Here's what the tortoise table has to say;
Common name : Jade Plant (Friendship Tree, Money Plant, Money Tree, Crassula Ovata)
Latin name : Crassula ovata; Crassula argentea; Crassula portulacea
Family name : Crassulaceae
These Crassulas are classed by some sources as being mildly toxic, contain oxalic acid and, like most succulents, can cause diarrhoea if eaten in excess. Many tortoises don’t bother with them, but feeding small amounts will do no harm.
Several varieties of Crassula ovata, like the ‘Gollum’ and ‘Hobbit’ have some leaves that curve inward and fuse into a tube shape.
No problem. I've tried to get it to grow in my humid enclosure and I've had no luck. I think the weather in the enclosure makes the plant not grow roots, because they aren't needed for taking in moisture. This results in no nutrients getting absorbed by the plant, and they just fade away. You could also try spider plant. But it will get eaten fast.