[section=The Bear and the Giant Cat] Against the bear, getting the stun lock is super easy as long as you let him turn around at the start of the fight. After that, just hold L or R and run at him until he zero-frames-of-animation erases from existence.
The giant cat has some extra stuff you have to deal with before you can quickly stun lock him. First, dodge his earthquake attack by jumping before he lands, then hopefully not short jump over his ball attack. After that, shoulder barge him while his back is turned. After the first hit, you need to delay running forward a tiny bit before going in again or you'll get damaged and drop the stun-lock.
If you drop the stun lock accidentally, you can still "one-cycle" him as long as you've at least dealt two damage before dropping it and you have full health. All you have to do is hold R while moving back and fourth inside of him.
[section=The Fridge] The Fridge is not as easy as holding R and running into a thing, sadly.
Before the Fridge launches a tentacle at you, it will flash red four times. Then it will do an attack based on its current health.
Phase one: One low tentacle. Just jump over it. Phase two: One double tentacle. Just crouch under it.
Every phase thereafter adds a tentacle, always starting with a low tentacle, then a double. After the tentacle attack, an enemy will be spat out the freezer. Kick the enemy into the fridge to deal a point of damage. When the Fridge has four hit points left, you're free to shoulder barge into it to deal the remaining damage necessary to defeat it.
If you don't kick one of the enemies, you can wait a cycle and have two enemies be on the screen at once. If there are already two enemies when the Fridge goes to produce another one, it does not spawn. You can skip the final phase by always having two enemies on the screen at once, then when the Fridge has six health left, kick both enemies into it before the next phase starts. Since phase one and two only have one tentacle, it doesn't matter if you wait for two enemies on either phase.
If you're feeling super risque, you can take hit a damage from a tentacle and kick one of the two enemies into the fridge while you have invincibility frames. This can shave off another tentacle attack, just don't die doing it.