Sometimes it is best to discard "Treeborn Frog" instead of setting it, because there is a chance the opponent will use "Nobleman of Crossout" on it. This will banish "Treeborn Frog", most likely making it useless for the remainder of the Duel.
This card can be brought out immediately after its been drawn with "Hand Destruction", even on your first turn.
When using this card's effect, there needs to be no Spell or Trap Cards on your field. This normally limits the Trap Cards that a player would have in their Deck, however consider using Traps that have a Maintenance Cost such as "Fairy Box" or "Mirror Wall". Just do not pay their cost and they are removed, so that this card can be Special Summoned.
This card, obviously, belongs in a "Frog" Deck. This card can be discarded for "One for One" to Special Summon "Substitoad", and then Normal Summon a monster and Tribute it for "Dupe Frog" for an instant lock. "Treeborn Frog" can be Special Summoned during your next Standby Phase if there is no Spells or Traps on your field. Then "Treeborn Frog" may be offered again.