arthropods
Please see the Related Link below for Harlequin Frogs.
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Rising temperatures, habitat destruction, and the spread of the deadly chytrid fungus have wiped out dozens of species of harlequin frogs in recent years.
harlequin ducks LOVE eating peanut butter with bananas dipped in and whipped cream on top
Omnivores.
yes frogs do eat small spiders
Frogs eat grasshoppers. At least i know bull frogs and wood frogs do.
they eat orther frogs
Yes, it's possible that a polar bear on land would eat a harlequin duck, though it's main prey is the seal.
echinoderms, crustaceans, molluscs, and worms
No, praying mantises do not eat frogs, they eat insects. Frogs are far too large for a praying mantis to eat them.
Frogs eat flies and other bugs.