The musicians in Rogue Wave look like Muppets. Guitarist-vocalist Zach Rogue (né Schwartz), his soft features framed by golden, surfer-boy hair, is the Kermit of the group; multi-instrumentalist and Houston native Gram Lebron, with his cheery grin and shaggy curls, is Rowlf; bassist Sonya Westcott, cute and easygoing, is Janice…