I have a standard upright freezer, opened it and realized that the kids
must of let one of their "blender creations" fall and smash to the
bottom, where there was sticky mess of honey and raspberry.

In the fall, the blender must have struck the bottom at an angle,
because now there is a 3/4" crack in the plastic at the bottom of the
freezer. This isn't actually the freezer bottom, but part of the
outside plastic that comes up and over the bottom of the freezer and
overlaps maybe 4-6" inside the the freezer.

I'm thinking it probably does not require anything. But maybe I am
wrong? If it does need patching, a glob of marine expoxy to basically
seal it?

At least the marine epoxy heats up pretty good as it sets and I imagine
anything else would have a hard time setting up, unless I turn off the
freezer for a couple of days and I'd rather avoid that....