IDK I just feel like these are not like their animals their suppoesed to be at all.

Here are my suggestions:

Grung

• Ability Score Increase. Your Dexterity score increases by 2 and your Constitution score increases by 1.

• Age. Grungs mature to adulthood in a single year, but have been known to live up to 50 years.

• Alignment. Most grungs are lawful, having been raised in a strict caste system. They tend toward evil as well, coming from a culture where social advancement occurs rarely, and most often because another member of your army has died and there is no one else of that caste to fill the vacancy.

• Size. Grungs stand between 2 ½ and 3 ½ feet tall and average about 30 pounds. Your size is Small.

• Speed. You have a walking and swimming speed of 25 feet. Your sticky finger and toe pads give you a climb speed of 25 feet.

• Amphibious. You can breathe air and water.

• Poison Resistance. You have resitance to poison damage and advatange on saving throws against the poisoned condition

• Poisonous Skin. You can liberate poison from your skin a number of times equal to your proficiency bonus per long rest. 
• • Any creature that grapples you or otherwise comes into direct contact with your skin must succeed on a DC 8 + proficiency bonus + modifier of your choice Constitution saving throw or become poisoned for 1 minute. A poisoned creature no longer in direct contact with you can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
  • You can also apply this poison to any piercing weapon as part of an attack with that weapon
• Standing Leap. Your long jump is up to 25 feet and your high jump is up to 15 feet, with or without a running start.

• Long Tongue. Your tongue is strong, sticky and can streach up to 15 ft. You can rapdly project your tongue to grab objects, grapple enemies or attack with small weapons such as Dagger or Dart. 

• Water Dependency. If you don't sleep wet by in water, you need to rest for 3 extra hours on long and short rests.

• Languages. You can speak, read, and write Grung.

Tortle:

• Ability Score Increase. Your Constitution score increases by 2, and your Wisdom score increases by 1.

• Age. Young tortles crawl for a few weeks after birth before learning to walk on two legs. They reach adulthood by the age of 15 and live an average of 300 years.

• Alignment. Tortles tend to lead orderly, ritualistic lives. They develop customs and routines, becoming more set in their ways as they age. Most are lawful good. A few can be selfish and greedy, tending more toward evil, but it's unusual for a tortle to shuck off order in favor of chaos.

• Size. Tortle adults stand 5 to 6 feet tall and average 450 pounds. Their shells account for roughly one-third of their weight. Your size is Medium.

• Speed. Your base walking speed is 20 feet and your swmming speed is 15 feet.

• Hold Breath. You can hold your breath for up to 1 hour at a time.

• Natural Armor. Due to your shell and the shape of your body, you are ill-suited to wearing armor. Your shell provides ample protection, however; it gives you a base AC of 17 (your Dexterity modifier doesn't affect this number). You gain no benefit from wearing armor, but if you are using a shield, you can apply the shield's bonus as normal.

• Shell Defense. As a reaction, you can withdraw into your shell as an action. Until you emerge, you gain a +4 bonus to AC, and you have advantage on Strength and Constitution saving throws. While in your shell, you are prone, your speed is 0 and can't increase, you have disadvantage on Dexterity saving throws, you can't take reactions, and the only action you can take is to emerge from your shell.

• Survival Instinct. You gain proficiency in the Survival skill. Tortles have finely honed survival instincts.

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

Frogs actually don't have long, sticky tongues.  That's a cartoon thing that happened when someone mixed them up with chameleons.

The Grung's tongue ability probably needs fleshing out for the Grapple, and honestly I don't see a 3-foot frog grappling an ogre with it's tongue! It's also quite powerful being able to attack with it, especially with the combination of poison and potential for magic daggers.

I would consider keeping the tongue thing but instead make it relevant for any touch-range spells and for any free object interactions, such as opening a door or picking up a goblet. Not only does this make them more unique compared with Bugbears who have reach on their attacks, it also makes for hilarious roleplay options ("I'll heal you! Quick Charlie, grab my tongue! *splut*").

Tortle is a bone of contention - on the one hand, a lot of people were confused by their short lifespans. Personally, I like it; it's breaking a stereotype, rather than conforming to one, and that's a good thing in my book. So I'm inclined to prefer Tortles living for 80-100 years tops, rather than hundreds. Otherwise can't see much of a change, except them having a swim speed and suddenly speaking Aquan, when they are based on tortoises, which cannot swim, much to the dismay of Americans who cannot distinguish between the two very different animals and refer to both as "turtle".