Linda and Paul McCartney, so the story goes, became vegetarians the moment they looked up from a delicious meal of roast lamb and saw a flock of lambs gambolling in the field beyond their cottage. Young readers of Pamela Freeman’s Lollylegs (Walker Books, $11.95 pb, 64 pp, 9781921529078) might well have a similar reaction, since the connection in Lollylegs between the meal on the table and the cute animal chomping on grass is made painfully clear.