Curious George (2006)

S1E19 Curious George Discovers the Poles

George visits his beloved Lake Wanasinklake and encounters Bill, who is fishing in the lagoon. Instead of fish, Bill has caught tadpoles and requests George to take care of them as they develop, mentioning their incredible transformations. Feeling the tadpoles are cramped in their tiny fishbowl, George chooses to set them free in the lagoon. However, when he later attempts to retrieve them, he only manages to catch a small green creature that may or may not be one of his tadpoles.