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You asked:

is a marshmallow a colloid

No. Marshmallow is not a subclass of colloid.
colloid
colloid
colloid

colloid (a chemical mixture where one substance is dispersed evenly throughout another)

Marshmallow
Marshmallow
Marshmallow

Marshmallow, a confection that, in its modern form, typically, consisting of sugar or corn syrup, water, gelatin that has been pre-softened in hot water, dextrose, and flavorings, whipped to a spongy consistency