Help with plants, are they poisonous?

[Starlite]

I have a large area (17ftx8ft) which I am hoping to turn into a little are for some cavvys

My issue is that there are plants growing on the area and I have no idea what they are! I have posted pics also as I cant use a pesticide and have weeded the are 4x in the hopes of removing them completely which hasnt worked, does anyone know what these plants are?

 

[BonBon2010]

I'd say you're better putting a few concrete paving slabs down and putting the run on that.. yes they are weeds, and I certainly wouldn't feed the piggies with it.
You could try this though.. you can get material from the gardening centre that you could cover the area with, which will kill everything under it through lack of light.
Then, rake it up and re-seed with grass seeds, water them, and fingers crossed you'll have a new lawn in no time

 

[Strawberries]

Yes, you can try covering the area with black plastic during the hottest portion of the summer for 2-3 weeks (or longer) to kill everything without pesticides, then prep the area for lawn and seed it or buy a few strips of sod.