Just the word "Blockland" is trademarked, not copyrighted. According to Wikipedia, a word with just the "tm" symbol is unregistered. The Blockland logo has a TM symbol, so it is an unregistered trademark. That means Badspot still has rights to it, but probably not as much protection as a registered trademark. If Badspot really had a problem with someone using it he might be able to get them to change it, but I don't think it would be something that would be worth taking to court.
Of course it's probably actually a good thing the app is named Bockland, people might search it wonder if it's any good and end up on the BL website.