Fridge is essentially playing a freeze team with a dendro unit, using Blooms as the main damage source. Although Cryo and Dendro doesn't react with each other, the reason why this team works is precisely because of this; Cryo and Dendro auras can co-exist on an enemy at the same time. Applying Hydro next would cause hydro to react with the first elemental aura on the enemy.
With this in mind, we run a typical freeze rotation, and switch to Nahida trigger blooms while keeping permanent freeze uptime.