Fatigle Very tired bird of prey

Doctor examining a frog with a stethoscope

Festivalium Tranquiliser for big events
Fisticupcakes Hitting someone with a spongy teatime treat
Flagonfly An insect in your beer
Fledam An insect in your cheese
Flobstacle Something in the way of a spittoon
Footpathematics Calculation of how many flagstones you need
Forkupine Eating implement with many prongs
Formaldehiecrust Mummified pastry
Froccoli Vegetable in a dress
Frognosis Predicting the course of a disease in an amphibian
Funstable Laughing policeman