No, it wasn't turn 3. Your first screenshot shows you at at least 11 cards, making this your turn 4 at the very least, turn 5 if you went first or took a mulligan. Your lands are also untapped and the cards you have played nessessitate you having had at least 3 turns already, again, making this turn 4 at the very least. With your opponent having played Icetill Explorer makes this his turn 4 (he played 4 lands normally, additionally one fetch land via Icetill and sacced it; the Icetill Explorer is summoning sick and tapped, so it entered the turn of your screenshot), the number of lands he has is within what he could have played. You not playing any lands is not your opponent cheating. You are at the time of the first screenshot in your turn 4 or 5.