I agree with RD. but it kinda varies bird to bird a little bit. generally speaking jakes will short gobble or half gobble. they can be picked out VERY easy sometimes. sometimes youd never know he was a jake...good gobbles and lots of them. and ive had longbeards come in i woulda bet the pot was a jake. alot of times i can pick them out...but once in a blue moon youll get a long beard with a funky gobble. jakes will indeed gobble their first spring. then the next year they are considered a tom or longbeard...

but be carefull judging them by the beards..ive seen pics of pure jake birds with 6 and 7 inch beards. usually they have a 1-4 inch beard that tents to stick straight out of their chests..the best way i found to judge them is their tails...if they go into full strut. the middle feathers on their tail will usually be longer than the rest of the fan by an inch or 2.