Breakdown of O crocodilo é que é mais feroz do que as pessoas dizem.
ser
to be
mais
more
a pessoa
the person
do que
than
Questions & Answers about O crocodilo é que é mais feroz do que as pessoas dizem.
Why are there two és right next to each other in é que é?
Since we're comparing the crocodile to "what" people say, why don't we need to say do que o que as pessoas dizem?
When introducing a full clause (a phrase with a conjugated verb, like as pessoas dizem) in a comparative, you can link it directly with just do que. While you will frequently hear native speakers add o que ("what") in casual speech to form do que o que as pessoas dizem, sticking to just do que + the clause is grammatically correct and very standard.
Could I drop the do and just write que as pessoas dizem?
It's highly recommended to keep the do. In simple comparisons between two nouns (like "ele é mais alto que tu"), you can often drop the do and just use que. However, when a full dependent clause with a conjugated verb like dizem follows the comparison, the full do que is heavily preferred in European Portuguese.
If the subject was feminine, how would feroz change?