I don't work for Itch and I don't represent Itch, however:
What most people do is change the name a little bit to avoid any problems that could happen. So instead of Itch, you could call it R̸̡̙͚͚̻̮̳͈̝̙̳̼̖͒̋̈́̐̋́́͛̑̂̆͜͜͠E̴̹̜̥͎̅̀́̉͊̊̎̈́̈́͆̋̕͠Ḑ̴͖̘̭͍͇̳͉̗̼̘̂̂̚ͅA̶̢̧̡̡̡͔͓̼̟̘̮͈̬̅C̴͚͛̀̋̎́̐̍̇͑̚͝͝T̸͈̣̝͗͐̓̇̊̑Ȩ̸͕̯̺̝̮͉̠̔̈́́͝Ḓ̵̢͚̦̝͍̻͖̪̳̥̬̠̮̀́̓͛͋͆̃̂̏̎͋̿̌̕. This would bypass the legal problems, but it would still be clear what you're referencing.
EDIT: Some people have expressed concern that Scratch, an online web game & movie development community vaguely similar to Newgrounds, may complain if you use the word "Scratch" as a stand-in for Itch. Fine, whatever. Call it Ootch then, if anybody's taken that in a vaguely video game-related context I'll eat an airplane.