All face-up monsters you control are treated as Plant-Type. During your Standby Phase, if you do not control a face-up "Naturia Pineapple", and have no monsters in your Graveyard except Plant or Beast-Type: You can Special Summon this card from your Graveyard. You must not control any Spell or Trap Cards to activate and resolve this effect.
Treeborn Frog is essentially a less restrictive Naturia Pineapple with the same effect. Treeborn Frog does not require you to have just one specific type of monster in the graveyard to revive himself, and you can revive him even if you control another Treeborn Frog on the field. The only relevant difference are their attribute, type, level, and Naturia Pineapple's effect to turn all your face-up monsters into Plant-types.
Since Rose Lover got banned Plant decks have been looking for ways to efficiently summon their high-leveled monsters. Naturia Pineapple works especially well with Sylvans because of their low spell/trap count meaning you can keep reviving him to use as tribute fodder. And the ability to send Naturia Pineapple from deck to graveyard is also beneficial, because it means you do not have to draw into it.
When used with his own archetype, Pineapple could act as a continuous source of tribute fodder. Use Naturia Marron to send him from deck to graveyard and keep him between there and the field. You can then use Pineapple as tribute to summon Naturia Stag Beetle. Since some Naturia monsters are Insect-types, you need to return them from graveyard to deck so that you can keep reviving Pineapple.
Since Naturia Pineapple turns all its controller's face-up monsters into Plant-types, you can use Mystic Box or Shien's Spy to send it to your opponent. Use Fragrance Storm to destroy one of your opponent's monsters and draw a card, and since you would usually run this in a Plant-type deck the chances of drawing a second card is high.