Vulture catfish?
It's not an Achara catfish thats for sure (which might be lucky considering I've had mine for 5 months and it has gone from 4" to over a foot)
Here's a couple more close-in pics of his head. He always has that dopey-looking smile on his face.
The guy said he paid "a small fortune" for each of them when they were small, but I got them both for $60 because I'm about to set up a 32W tank and they were getting too big for his tank.
x2. Your TSN appears to have this same syndrome. I had theorized that this actually starts at a young age due to excessive stunting very early in life of catfish. I have seen this in a variety of different species of catfish. I also had a tsn named lumpy that had this very severely. Nothing you can do for it and as they grow it gets worse. It may get bad enough to where they cannot eat in the future. The tsn I bought from a lfs had it on sale for 8 mos before I bought it. It never grew while at the store. It was 2".