Slooms in Gloaming Wildwoods?

I remember finding a Sloom the other day in a forest level (which I think was Gloaming Wildwoods). Is this normal? I took the Sloom out before any other monster because I thought it was a shock-inducing monster.
And I am NOT lying! I could've sworn I saw a Sloom, or atleast something identical to it!

I saw one. Looked like Slooms merged together into one. Obviously it suppose to be like that. I saw it before I got hacked a lot of times. :L

Sloombargos uesd to spawn ages ago in the Shrine of Slumber (please give levels back, devs D:) but since those levels were removed they no longer appear in game at all, like the Tortodrone. I feel like the Tortodrone should be modified and brought back in, like a Alpha Wolver style attack (maybe 5 instead of 3, or something) instead of the constant never-ending stream of attacks it used to have, and remove the shield drop it gave. It was a unique and interesting enemy, but it's constant onslaught of attacks was pointlessly overpowered (Like RJ, but he's not gone :<) and the drop made the shield not special to have since everyone had it.

It could have been either a Sloom or a Soul Jelly. Soul Jelly will replace a lichen, but contains a small skull when killed. They are a similar color, you can tell it is a Sloom though before killing it by the Z on its back.
Yes, that probably was probably a Sloom. They appear in those monster cages, if that's where it came from.
Lucky...you saw a Sloom...