Misc: mark, rouble and escudo are all types of what?

Questions

Which of these nuts is not actually a nut - peanut, cashew nut, macademia nut?

Which one does most of the hunting the male or the female lion?

Which one is Frankenstein the monster or the man who made him?

Which one is smallest boulder, pebble or stone?

Which one seldom goes in the water a frog or a toad?