I'm new to frogs. I have a few questions.

[HomicidalHippie]

First of all, I have a Northern Green Frog...I think..might be an American Bullfrog. Her name is Karmen. She lives in a 20gallon.
QUESTIONS
Do aquatic plants help keep the water clean?
Do I need to have a bubbler to aerate the water?
Do I need a bubbler if I plan to keep feeder fish in Karmen's tank?
Should I get a filter even if I replace the water every few days?

[KingCam]

First of all, I have a Northern Green Frog...I think..might be an American Bullfrog. Her name is Karmen. She lives in a 20gallon.

I believe that is an american bull frog. They make fun pets, but eat and poop A LOT! Make sure you have a good sturdy lid, they can jump with some serious force.

Do aquatic plants help keep the water clean?

Yes.

Do I need to have a bubbler to aerate the water?

You don't absolutely need it, but it would be beneficial to the water quality and thus to your frog.

Do I need a bubbler if I plan to keep feeder fish in Karmen's tank?

Yes.

Should I get a filter even if I replace the water every few days?

Yes. Bullfrogs are messy :P

[HomicidalHippie]

Thank you for actually replying.
Another question; If I don't have a bubbler, will the plants die?
I have one around the house somewhere....I just have to find it. But if I don't, I wanna know if the plants will die within a week without it.

[KingCam]

Thank you for actually replying.
Another question; If I don't have a bubbler, will the plants die?
I have one around the house somewhere....I just have to find it. But if I don't, I wanna know if the plants will die within a week without it.

If your plants are truly aquatic they'll be fine without a bubbler. If you're trying to grow ivy, pothos, or some other land/water plant you'll want to have a bubbler in there. They won't die right away or anything, but their roots will be much healthier if bubbles are going through them, or at least near them.

[UncleChester]

First of all, I have a Northern Green Frog...I think..might be an American Bullfrog. Her name is Karmen.

Pretty frog. Does she have dorsolateral ridges, i.e. a fold of skin running from the back of each eye down along the back? Northern Green Frogs have them, Bullfrogs don't.

[HomicidalHippie]

Pretty frog. Does she have dorsolateral ridges, i.e. a fold of skin running from the back of each eye down along the back? Northern Green Frogs have them, Bullfrogs don't.

No, I don't think she does. Thanks for clearing that up for me. :]