Amphibia

Amphibia is a 2019 Disney animated series that follows a girl named Anne who gets teleported to a world inhabited by frogs.

Anne or Beast?
Season 1, Episode 1a Airdate: June 17, 2019 (Disney Channel)

Sprig: Polly, I just had a great idea. I am going to catch that beast and save the town.

Polly: (Puts one of her flippers up.) Stop right there! Hop Pop said that you had to stay in this cart. (She flexes her muscles.) You know you can't take me!

Sprig: (Grunts in frustration.) Oh, oh, Polly, look. (Grabs out candy from his shirt.) Candy! (Blows raspberry and drops it.)

Polly: Bribe accepted! (She eats some of the candy.)

Sprig: Let the monster hunt begin! (He goes into the forest.)

Polly: Don't die!

Family Shrub
Season 1, Episode 8b Airdate: June 27, 2019 (Disney Channel)

Did show her muscles when she said something about one of the family members is strong.

Toad Tax
Season 1, Episode 10a Airdate: July 2, 2019 (Disney Channel)

Polly: I'll bite your face of!!!

Civil Wart
Season 1, Episode 12a Airdate: July 4, 2019 (Disney Channel)

Polly: I'll tell you who she picks! Hunter... (flexing both arm muscles) He's a beefcake!

The Big Bugball Game
Season 1, Episode 18a Airdate: July 16, 2019

In the scene of the episode, Lydia is a short-time Froglympian and Bugball Player. She plays for The Townies team during the annual bugball game on Harvest Day, making her debut in the episode "The Big Bugball Game". She was voiced by Eden Riegel.

Handy Anne
Season 2, Episode 1a Airdate: July 11, 2020

The Ballad of Hopediah Plantar
Season 2, Episode 2a Airdate: July 18, 2020 (Disney Channel)

Quicksand
Short #6 Airdate: July 12, 2020

When Anne gets stuck in quicksand, Sprig, Polly, and Hop Pop have to figure out how to get her out! Polly does weights and using her muscle arms grows massive size by pulling Anne out the quicksand but unsuccessful.