It did occur to them, in fact. As said before, they had to awkwardly ask if he needed meat to survive. They would have gone out to get him bugs or worms if they needed to, despite not being used to catching them for food. Luckily for them, they didn’t need to make that adjustment. Wellwood is plentiful with all kinds of non-meat foods that provide the nutrients a young Sam could need.
And lets remember that Sam isn’t a big meat-eater like his brother is! It would be easier for him to adapt to a steady diet of roots, vegetables, mushrooms and fruits, along with Sam and Bowman’s favorite honeycomb!
Brothers Apart 