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Unfortunately, this describes several genus, species, and cultivars. Giving you a name of a plant will be difficult. If you can find a picture of it then this can help. I would recommend looking around at your local nurseries or online ones for ideas on what this could be.

When a succulent stretches, it is searching for more light. If your plant is indoors and on a windowsill, it’s possible it needs a grow light to prevent further stretching. There’s much less light in the fall, and the shorter days can have an affect on your light-loving plants.

It’s impossible for your succulent to “shrink” back to normal, however, you can still save it!

The easiest way to “fix” a stretched succulent is to behead it, planting the healthy top portion.

https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/propagating-cacti-and-succulents.htm

The good news is that there appears to be some living tissue left. This means that with time and proper care, it can come back.

You will just have to provide the right environment, and treat it as you would the original, but with less watering since they will use less.

This article will give you more information on the care of Kalanchoe succulents: https://www.gardeningknowhow.com/houseplants/kalanchoe/growing-kalanchoe-plants.htm

We do not sell plants from this site. Try doing a Google search. Also look for more unusual plants of Etsy and EBay!
https://www.gardeningknowhow.com/ornamental/cacti-succulents/dolphin-plant/growing-dolphin-succulent-plants.htm

Please upload some images so we may help you.

This is normal, as it will eventually develop a woody stem. Just to be on the safe side, though, I would recommend letting it dry out pretty well between waterings.

Here is an article for more information:https://www.gardeningknowhow.com/houseplants/jade-plant/jade-plant-care.htm