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Phrase(s): The biggest frog in the puddle [and] The biggest toad in the puddle
Prov. The most important or powerful person in some small, unimportant group. (See also a big frog in a small pond.) • Jill: Elaine seems to be obsessed with becoming class president. Jane: Yes, she really wants to be the biggest frog in the puddle. • The people in my office don’t care about doing their work; mostly they compete over who will be the biggest toad in the puddle.
McGrawhill's American Idioms And Phrasal Verbs