The phrase "troll for" is typically used to describe someone who is searching for something, often in a negative or antagonistic manner. However, there are a variety of synonyms that can be used in place of this phrase, depending on the context and the specific meaning that is intended. For example, "hunt for" is a more neutral alternative that can be used when discussing the search for something specific, while "fish for" implies a more leisurely approach. Other possible synonyms include "scavenge for," "prowl for," and "root around for," each of which conveys a slightly different nuance or implication.