Cheetara was the master of disguise.

Tygra may have been invisible and an excellent spy for the Thundercats, but no one could really equal the tenacity and creativity that Cheetara employed when she went undercover. She was everything from babies to grandmothers to quarrymen to a giant baloon in the shape of a cellular phone. Details on that last disguise are sketchy and much is still classified, but Tygra and Panthro have both been known to tease the cheetah mercilessly. Doubtless we will know the truth someday.