CONSIDERATIONS TO KNOW ABOUT CARTOON RIDDLE

Q: My skin is green and slippery, I have 4 legs and webbed ft, I hop on land and swim underwater, I like bugs and very little fish to eat. What am I?138. I come in many alternative shades and I get more substantial Once i’m total. I'll float away should you don’t tie me down And that i is likely to make a loud sound if I crack. What am I?Riddle