Tom se comió un segundo sándwich.

English Translation

Tom ate a second sandwich.

sándwich or Bocadillo?

Both words are correct. A sandwich is made with sliced bread, while a baguette is used for a bocadillo.

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English Translation

Tom ate a second sandwich.

Since “comer” is not a reflexive verb, why was the “se” necessary?

I wouldn’t say it’s necessary, but it gives a nice idiomatic touch. It’s very common to add a seemingly redundant reflexive pronoun for emphasis: he probably ate it hungrily. You will also see this with beber - beberse.