Bubble Text?

Here's a cool download from JK.

https://community.articulate.com/download/powerpoint-13-speech-and-thought-bubbles-0b596c4a-9513-4d2e-a5c0-df11af08e531

You an modify them in PowerPoint using the edit points and combine shapes features.

Here's an older post with some chat bubbles, too.

https://blogs.articulate.com/rapid-elearning/over-45-free-speech-bubbles-to-make-your-e-learning-courses-talk/