Liz is a character in The Magic School Bus.
Liz is the class pet Jackson's chameleon who while goes on most of the field trips with Ms. Frizzle and the students, often getting herself into dangerous comedic situations. She also appears to get jealous when the bus receives more attention than she does. In the episode "Gets Ants In Its Pants", she is visibly annoyed and disappointed when she does not get the recognition she deserves.
Liz is mute, but she is often does things that one would not expect from a chameleon in real life, such as driving the bus. When she goes to Herp Haven for a brief period her packing list includes claw polish, scale moisturizer and fang-paste. If Ms. Frizzle has to leave the students for a brief period for any reason, or if the class must split up, she leaves Liz in charge, acting as a sort of substitute teacher. In "In a Pickle", she is the supposed "Judge" in Ms. Frizzle's trial for stealing Keesha's 1st prize cucumber/turning it into a pickle (she wears the wig, and the outfit, and carries the gavel).
While Liz is mute on the show, but she can speaks in the CD-ROMs (although it appears that only the player can hear her). She is also seen at the end of most episodes with the producers of The Magic School Bus.
The Magic School Bus (1994)