Forum:Malenlightened Frog attack block

If there are two face-up Malenlightened Frog on my side of the field, will the opponent be unable to attack any monsters in my side of the field? And can they still attack face-down monsters?

Another question: I have a face-down Flipped Frog and a face-up defense position Substitoad. My opponent attacks Flipped Frog. Will my Frog be destroyed by battle or will it survive due to Substitoad's effect? Thanks.