The word disfrazaran is the imperfect subjunctive form of disfrazar in the third person plural.
See the full disfrazar conjugation


¿Por qué se disfrazaran de Santa Claus?
Why are they disguised as Santa Claus?
-¿Qué es esta música? -La cambiaré! -¿Les dijiste que se disfrazaran? -¡No puedo pensar en todo! -Genial.
What is this music?! I'll change it! Did you tell them it's fancy dress? I can't think of everything! Great.
¿De qué los disfrazarán en Halloween?
What are you two guys going as for Halloween, huh?
Se disfrazarán y se pondrán su vestuario de esa manera, podrán entrar en el palacio sin ningún problema.
You will disguise yourselves and you will get into their costumes, and that way you will get into the palace without any trouble.
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