Formal & Technical:
* Dialogue Bubble: Emphasizes the speech function.
* Word Bubble: More general term, emphasizing the containment of words.
* Speech Cloud: Suggests a more ethereal, less defined shape.
* Callout: Used when the balloon contains narration or other non-dialogue text.
Informal & Creative:
* Thought Bubble: For balloons containing thoughts or internal monologue.
* Word Balloon: A simpler, less technical version of "Speech Balloon."
* Chat Bubble: Modern slang, particularly for digital communication.
* Talkie: A playful, child-like term.
* Bubble: A general term, often used in casual conversation.
Specific to the content:
* Scream Balloon: For balloons with loud, exaggerated speech.
* Whisper Balloon: For balloons with quiet, hushed speech.
* Thinking Balloon: For balloons containing thoughts or internal monologue.
Note: The best alternative name depends on the specific context and the desired level of formality.