I don't think putting something in a freezer would disinfect it. Stop the microbes from breading while it's inside, but they start again quickly as soon as it gets out.
Ice crystals can and do rupture cells. But it's not a good method to disinfect as a lot depends on the freezing rate resulting in different crystal sizes.
It does depend. Some microbes die when being frozen, but generally heat is much more effective (though you probably shouldn't cook your Fleshlight and use some disinfection sprelay (etc) instead)
Freezing can kill bacteria, but only at temperatures far below what the standard freezer can reach. They do this for many seafood products sold commercially.
There are a bunch of fake meat products intended for vegans. Fake steaks, fake thanksgiving turkeys. Usually made out of seitan (gluten), tofu, or mung bean proteins. I don’t think any of them resemble fleshlights…
My local pan Asian has had “vegan pork uterus” for ages.