When I was a child I took my 2 Greek tortoises all summer daily to the forest and they ate whatever they wanted. They chose what they wanted to eat in the forest and meadow, took long sun baths and were very healthy.
I don't know all of those and each pic has multiple plants. There is a lot of horse weed in pic number three and that is a do not feed.
I think the little white flower clusters are alyssium, but I'd have a local nursery verify that. They can eat some, but it doesn't seem to be a favorite.
I could be mistaken, but I think I see some broadleaf plantain on the far left of pic number two. If I'm right, that is an excellent tortoise food.
The yellow and brown flower in the first picture is a cosmos relative, which is in the sunflower family. Safe in moderation.
I think the white flower in the first and second picture is actually hemlock; it’s hard to say when everything is growing in the picture.
This is hemlock, what you want to focus on is the shape of the leaves. Hemlock is obviously a do not feed.
In the third picture on the right is a tube shape purple flower, different than the other fluffy flowers. I think it’s a flowering vetch. That’s safe to feed a little bit.
I think there is one other plant in that photo? On the very low front right is something that might be a white or pink flower? Or maybe it’s just one of the other flowers and the shot has gone fuzzy.
If you can find out the names www.thetortoisetable.org.uk may be able to help, but even without a name you may be able to use their database to identify the plant by flower colour.