You can find these little guys in basically any beach. Tamed one and saddled it and it is quite useful! You can also fish while on it in the water which is really useful if you dont have a raft. However the speed is quite low and you cannot hold creatures with it.
You can tame it on primitive plus but you need to make the kibble in a cooking pot. It won't work if you make it in a cauldron. Hopefully that's helpful to those that are trying to make kibble but cannot.