The 3rd pic is horse weed. Do not feed. Pull it straight up and out by the root and throw it away before it goes to seed.
The fourth pic is broadleaf plantain. Excellent tortoise food. Soon it will send up a seed head to the sky. When those seed heads dry out, collect them and plant those seeds every where you can. Same with the narrow leaf plantain. My tortoise like the narrow leaf better than the broadleaf, but try to grow them both.