"ll" as in "llamar", "llama" or "pollo" is pronounced with "j", as in jewel, but the spanish word "yoyo" or "yeso" are pronounced in the same way.
Nevertheless, argentinean people say "llamar" ( to call) with a "sh" sound. Example, they say "sho the shamo" ( This is not the exact pronunciation).
Look for spanish phonetic sounds