as an amphibian you are able to breathe under water and on land without any disadvantage

Your powerful tongue can spring from your mouth to be used like a grappling hook both within and outside of combat. In combat, as an action, you can make a Ranged Attack with your Tongue. The range is 30 ft. When you hit with it, your strike deals 1d6 Bludgeoning damage, and the target must make a Dexterity save or be grappled, as your tongue wraps around them. When grappling a target this way, if they are your size or smaller, you can use a bonus action to pull the target 10ft toward you. The target may also move toward you voluntarily, but they cannot move away from you. On the target's turn, they can use an action to make Athletics (Strength) or Acrobatics (Dexterity) check, contested by the grappler's Athletics (Strength). You can also cast your tongue at objects within 30ft. If it is unsecured, and under 20lb, you can pull it toward yourself. It the object is secured, like a flagpole, your tongue wraps around it, and you can pull yourself toward it.

A monster with tremorsense can detect and pinpoint the origin of vibrations within a specific radius, provided that the monster and the source of the vibrations are in contact with the same ground or substance.

Tremorsense can't be used to detect flying or incorporeal creatures. Many burrowing creatures, such as ankhegs, have this special sense.

You have resistance to cold damage

Your Intelligence score increases by 1, and your Dexterity score increases by 2.

Frogs mature at 1 year old and usually retire at 50.

Frogs are small creatures.

Your base walking speed is 25 feet.

due to webbed membrane your swimming speed is 40 feet.

You can speak, read, and write Common and Aquan.