In any sentence with plural objects, such as:
Would I use the être plural sont, or the object standard third person est.
Les sandwichs sont bon.
Les sandwichs est bon.
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Unlike English, French has six different conjugations. It has three for singular subjects, and three for plural subjects. They are pretty straightforward:
So you're right that "est" is third person, but it is third person singular. Because your subject is third person plural, you need to use "sont".
Les sandwichs sont bons.