This story reminds me... my kids caught 5 tree frogs today and had them in a paper cup that tipped over in the car on the way home from church. By the time the tipped over cup was noticed only one frog could be found. A thorough search was conducted in vain. 4 treefrogs will eventually be discovered, mummified, somewhere in the station wagon. Maybe I should call my neighbor over to search, too. He's French....
Probably jumped out. You'd smell a dead frog.