Little Cricket's voice is normal even when she is tiny. It should be high-pitched, both because of the physics and because of the continuity within the Boys universe - Termite's voice also got pitched up when he shrunk.
Andre's screenshot does not constitute proof or even evidence that Sam is still alive.
It makes no sense for Little Cricket to look down fearfully into the abyss when she is standing on Sam's food tray in her tiny form. After all, she must be an extremely fit and fearless free-climber to even have gotten up there in the first place while it was being pushed around on a 20-story food cart that was racing around the "forrest" at what, to her, must have appeared to be highway speed.
In relative terms, small animals lose a lot more energy than large ones. This is because the surface area (which transfers heat between the animal and the environment) only grows by the square power while the volume grows by the third power as beings get larger. So small animals have a much greater surface in proportion to their body volume than larger ones. This means that Tiny Cricket should be losing a lot more body heat in her tiny form, so she would constantly be cold and need to wear thick layers of protective clothing when shrunk, and need to keep moving, much like a hummingbird.
Also she should not be able to go nearly as long without eating than tall Emma could at normal size, severely limiting the time she can spend in the shrunk state because eating causes her to get tall again.