Because of your quick-footedness, your Dexterity score increases by +2. Your Charisma also increases by +1, as animals are more keen on trusting you because of your unassuming form. 

You can easily swim in the water, but you do not have the ability to float. You must be touching something that is floating at the end of your turns while in freshwater or begin to sink at half your walking speed/round. 

Because of your slimy nature, fire is less effective on you. You take half damage from fire. This slime also grants you advantage on attempts to escape a grapple.

You've grown up in the forests or swamps, so you know your way around and can easily maneuver around difficult terrain while in these areas.

You have a tongue that can reach a little further than most critters. It's also quite sticky, allowing you to catch prey out of the air. If a target is larger than you or of the same size, they can attempt to escape the attack. If the target is smaller than you, they automatically fail and are swallowed.