I don’t have an ID for it I’m afraid, but I think it might be partially how the plant grows, and partially too much water. See the other comment on the thread: get a different soil that dries faster, make sure to have holes at the bottom of the pot, water less.

I second this opinion, albeit with less fancy words ^^’ also feeling sillly that I did not catch it on my own.
Do you think the one by the window is doing better because more sunlight helps it dry faster ?

Succulents are a big group of plants, and aloe just a part of it, but they broadly need the same kind of care: lots of light, not too much water.

How big does it get ? That looks a bit like a baby plant, which is a more difficult to ID.
Some plants are leggy like that, but sometimes it’s a lack of light. Does it grows toward the window ?

cool! Did they all worked or did you had any losses?