Welcome!!! I always suggest WTF for first frogs. They can be kept at 60% hummidity and are more forgiving until u get into the frog groove. They get big- up to 5 inches. I'm bad at converting to metric, sorry, but 20 gal for each frog leaves plenty of room to play. They are night owls, but will get up early and stare at you till you give them a treat! They do require heating, they like it 80 degrees or 32 celcius. Funny grins and cute little faces with a long life span of 20 years, makes them a very popular pet around the globe. There's a care sheet to the left and plenty of action on utube for you to check out!
Good luck with your search and again welcome to frog forum!!