Generational Word Confusion

The children, in my young adult historical adventure novel, sleep on straw-stuffed pallets in 1775. A young beta reader expressed confusion. She was picturing the wooded structures boxes sit on–SIGH.

What is another word for pallet, or how do I give further details without becoming wordy from a 1st person point of view? In other words, “I lay Charlie on his straw-stuffed pallet.”

Here is an example of a 1700’s pallet on a rope bedframe, but imagine it on the ground and easy to roll out of the way. I’m thinking about adding a footnote to the page words like this are first mentioned on.