Wallop rhymes with:
dollop, polyp, billup, cullop, delap, delapp, develop, dollop, envelop, fillip, fulop, gallop, gallup, heslop, hislop, hyslop, julep, mckillip, mckillop, philip, phillippe, polyp, redevelop, scallop, tellep, tulip, underdevelop
Wallop sounds like:
walby, wallaby, walp, welby, welp, willapa, wolf, wolfe, wolff, wolpe, woolf, woulfe, wulf, wulff