Give Ben and his cousins a snack before bedtime which word in the sentence is an indirect object

So, yes it would be "snack". An indirect object answers the questions To or for whom? or To or For what? after an action verb. A direct object is a noun or a pronoun that receives the action of the verb.

Ex. Give Ben and his cousins a snack before bed. Give who a snack before bed? Ben and his cousins. This is a direct object example.

Snack, because it is an object but not specified like ben, cousins (because people) or bedtime