I don't think any of them
registered under CTM (Community Trade Mark for EU). And trademark is regional. And I haven't found any using the word "scroll" in
WIPO-madrid (international registrations). There are only "The Elder Scrolls"(word) registered in CTM. There are some registered containing sequence of "scroll". (numbers depending on what you think of "scrolly", "g-scroll", most are none-related).
But the usage of "scrolls" is not just related with registered trademark. You can called your game whatever name you like (unregistered). Most developers don't bother spending money to register and maintain IP right (let the legal problem slide, and only deal with them when they got famous), most they don't think the money from selling games is worth it. But this time Notch actively registered (or trying to) a word that is controversial in legal terms, and it got published. So the big B has to fight on the surface of legal ground.
Come to think of it, it's a complement to Notch's success, they put so much effort in it, means they really think Notch's Scrolls game will be a possible big hit and famous. So they will play the legal dance of who got more famous out of end deal. And probably end-up paying less money than some publicity campaigns. (Or is this already in one of the campaign? It will benefit Notch as well. Free news converge). And if Notch somehow wins, Notch's game will not be indie anymore (some say he already aren't).