CARTOON RIDDLE NO FURTHER A MYSTERY

Q: My pores and skin is eco-friendly and slippery, I have 4 legs and webbed ft, I hop on land and swim underwater, I love bugs and little fish to consume. What am I?Concern: The ages of the mom and his daughter insert around 55. For those who reverse the digits with the mother's age, you can get the daughter's age. How previous are they?Riddle: A b