There is a knome in my walrus, Billith, he ate it yesterday and now i dont know if i bring him to ER?

One day, Billy was very hungry and I had no more fish in my fridge so i let him out to play in my garden. When he saw my knome, Charles, his appetitie grew and he couldn't help but swallow poor Charlie! Poor poor poor poor Charlie :( So should I take him to the vet?