Answer: The indirect object in the sentence "Coaches give hockey players facemasks to protect them from injuries" is "hockey players".
Step-by-step explanation: An indirect object is a noun, a noun phrase or a pronoun that acts as the recipient of the direct object. In other words, the indirect object, which can only be present if there is a ditransitive verb, is the person who receives the direct object. In the sentence provided, there is a ditransitive verb ("gave"); therefore, the indirect object is "hockey players" because they are the ones that receive "facemasks", which functions as the direct object in the sentence.