It doesn't freeze - one use of anti-freeze is in your cars radiator it stops it from freezing up in the winter, no anti freeze and you run the risk of a frozen radiator, car over heating or even worse a cracked engine block.
No... they have a similar function in absorbing heat and exchanging it to the ambient air, but that's where the similarity ends.
your radiator cap is probably bad, and its pushing too much out at once, try replacing the cap
Dex-Cool and Mopar antifreeze (often based on ethylene glycol) are not typically compatible. Dex-Cool uses a different formulation and additive package, which can lead to issues like gel formation or reduced cooling efficiency when mixed. It's generally recommended to use the specific type of antifreeze that is designated for your vehicle to avoid potential damage and ensure optimal performance. Always consult your vehicle’s owner manual for the correct antifreeze specification.