Yes, like you, rats do eat quorn.
Can Rats eat Quorn
Yes, your pet rat can eat quorns. Remember, this product was first tested on rats before releasing for human consumption.
You should feed as occasional treats as it is super high in fiber.
ALSO SEE: Can Rats eat Quinoa?
Alternative to Quorn for Rats
An alternative to feeding quorn to rats is using soya flakes in their base mix. I do not see tofu as a meat replacement, but rather a food in its own space. My boy and girl rats lose go nuts at the sight of tofu dunked in wasabi or soy sauce.