Pinhead Cricket Question

[numpty]

"Pinhead crickets" is just a term to describe newly-hatched crickets, of whichever kind. They'll grow to however large adults of that particular species get ... probably up to an inch for most feeder types, I would imagine. Too big at the upper end for dart frogs, obviously.

I don't own dart frogs, but I'd imagine feeding them would be similar to feeding frogs I've kept of a similar size. Maybe others with more experince will chime in, but I would guess that crickets up to a week or two old would be fine. (I have a frog of little more than an inch length, and he'll happily eat crickets up to about a third of an inch, though I try to go smaller.)

You could breed your own, but you'd always want to have juveniles of the right size available. It's quite a long process. Most people breed flightless fruit flies for dart frogs. This is a lot easier, and you're always guaranteed to have the right size. The downside in my experience is that fruit flies are frustratingly good at escaping. Bowl feeding doesn't work with them!