bumblebee dart frogs

Hi, ive had 3 leucs for around 2 years, they've never bred so i always thought they were three males as they are always calling. This morning when I went to feed them one appeared with a tadpole on his back. the viv is large and there are lots of plants so there could easily be more tads in...

I bought two bumblebee dart frogs from a breeder and was told they were 9 months old, they were both about 3/4 inch, but I did a lot of research that suggests these guys can grow to over 1 inch at 6 months of age... my question is do they stop growing in a smaller enclosure? or was it possible...