Its always difficult to tell from pictures but the first one looks like lambs lettuce to me. It grows as a weed in my garden. In fact I had some for my lunch.
I'd say the second one was Everlasting Pea (as Dumnonian says Lathyrus latifolius). The first one may well be Lamb's Lettuce (Valerianella locusta), the leaves do look right for it but it's hard to be 100% from a pic. Third, yup. Morel (Morchella esculenta) https://www.rogersmushrooms.com/gallery/DisplayBlock~bid~6466.asp
The perennial pea? Miles Irving in his book Forager says yes, although Pfaf* suggests caution:
Quote:
Although no records of toxicity have been found for this plant, the seed of some species in this genus contain a toxic amino acid that can cause a severe disease of the nervous system known as 'lathyrism' if they are eaten in large amounts (although small quantities are said to be nutritious)[65, 76]. Great caution is advised
Based on that I'd probably be cautious of the seed but as I have some growing in the garden and I'd planned to try the young shoots lightly steamed and popped into a risotto (basically the sort of thing I'd do with cultivated pea shoots) so if it goes quiet you'll know I've keeled over!