Valk rhymes with:
balk, calk, crosstalk, falk, falke, faulk, gawk, hauck, hauk, hauke, hawk, hawke, hok, kalk, kauk, lauck, little-rock, maroc, mauck, mauk, medoc, salk, sauk, schalk, squawk, stalk, talk, walk, walke, yeosock, zwack
Valk sounds like:
valasek, valek, vales, valeska, valis, valko, vallas, vallejo, vallejos, valles, valley's, valleys, vallez, vallis, valls, valois, valueless, values, values', valukas, veals, veilleux, veils, velasco, velasquez, velazco, velazquez, velez, velika, veliz, vellucci, veloso, veloz, vials, vilas, viles, villa's, village, village's, villages, villas, ville's, villegas, villwock, violas, vlach, vlachos, vlahakis, vlahos, vlasak, vlasic, vlcek, vlok, voelz, voiles, voles, volga, volk, volleys, volokh, volz, vowels, vowles, voyles