Yeek

Yeeks are jumping, energetic, frog-like creatures exclusive to the Downpour DLC with similar build like appearance of the, they are passive creatures that jump around open spaces with their two webbed feet and commonly found together in groups without straying too far from the pack.

Appearance
Yeeks have two fully black oval eyes, a medium-sized body with the middle having two bumps on each respective side, usually features dots scattered on its back, and two long stretchy flat feet. Which can help them jump from great heights and even climb poles.

Utility
Yeeks can help reach platforms that are too far up for to jump, by drastically increasing Slugcat's jumping height, in which the Yeeks will stop jumping independently and let the player control it by carrying them at the drawback of requiring two hands and being heavy in order to utilize its ability. Getting your hands on one can be quite a nuisance by Yeeks continuously jumping making them difficult to catch with your hand. Slugcat can also use Yeeks to climb poles much faster.

Abilities & Behavior
Yeeks doesn't respond much to noise, creatures or their environment, instead aimlessly jumping around whichever direction the leap goes using their legs switching to left and right. They can climb poles using their two feets to accomplish it and crawl through tunnels by bobbing their body up and down presumably jumping then hitting the top to propel itself slightly.

Jumping
Yeeks jump aren't consistent jumping high or low and switching directions, being able to avoid predators by jumping onto platforms or jumping over them but can sometimes lead to its demise by jumping into a predator's mouth or falling off a cliff.