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No, not all frogs are able to call, but most of them can - the modification of the lungs, chest muscles and vocal cords for calling are seen in the majority of frog (and toad) species, but these tend to be the "newer" frogs, or "neobatrachia" and "mesobatrachia" as is the scientific names for these large groups.
The early/older frog groups such as the tailed frogs (Ascaphidae) don't call at all and the tongueless frogs (Pipidae) generally don't call, those that do don't use the same mechanism of vocal cords as "typical" frogs do but use their larynx to make a series of clicks heard only underwater.
There are also some "newer" frog species that had calling ancestors, but they have since lost the ability to call. Species like the harlequin toads of Central America (Atelopus) live by waterfalls and loud, fast flowing rivers. There isn't much point calling next to a waterfall that will just drown them out, so they actually attract females using what's called a "semaphore" system - which is where they use their legs and "wave" in a very colourful visual display.
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RossWell, it is very hard to tell because soem people say YES and some say NO. but i say yes and no because there are different frogs so you can't really telll.. Also, when frogs croak they sometimes squeak... So i say a matter of Yes... But to make sure you Google the ranger's Blog because that is a goot bolg to read about frogs squeaks...
Frogs cannot talk but they do communicate by making sounds. Most of the time sounds are made to attract the opposite sex, but sounds are also used to warn off individuals from the same sex, especially the males. Also, soms frogs communicate by vibrating their body. Other frogs on the same treebranch can detect the presence of the vibrating frog.
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