I'm sure it's not chickweed, which has opposite leaves.
It looks like a spurge; if so, it will bleed a milky sap when you break a stem. Try it, and report back.
I don’t think it’s purslane. I 2nd the spurge. Which is a do not feed.
It’s not purslane. Purslane has very “fleshly” leaves, almost like a succulent.
@Tessa127, in Orange County we have an invasive spurge that is so irritating to human skin it is used to “burn” certain skin problems off the body. I’ll feed just about anything but not that plant!
I don’t think it’s the same spurge as in your picture but I wouldn’t feed yours until I knew exactly what it was.
Thanks @RosemaryDW ... I'm not taking a chance. But man, little tort went right for it!!!! Eeeeekk!