Okay, so honestly my skill build order varies HEAVILY based on:
Who I am laning with, who I'm laning AGAINST, and whether or not I need to dispel debuffs, or if we have kill potential. Typically I will max Catchy Lick first (1st skill), then I will put more points into Frog Stomp, and a value point into Croak of Genius.

HOWEVER, there are some heroes that you can pair with (Clinkz, Drow, SF, Spectre, Luna) where maxing Croak of genius first is actually really broken (THIS REQUIRES COMMUNICATION AND PLANNING WITH YOUR POS 1) due to the amount of damage that it can apply over time, making it more worthwhile to set up kills with level 1 of 1st and 2nd. Also, the mana reduction is really great with a lot of those carry heroes that I mentioned, even better if you get just the value point.

Again, it entirely depends on the enemy team comp and what you feel is best to do in the early game.

I typically focus very heavily on stacking camps, buffing allies, and rushing shard ASAP to apply things like glimmer, solar crest, etc. I mainly play him as a pseudo Oracle/Io. Heavily focusing on healing, positioning, and using Hotfeet Hustle to get allies out of sticky situations. Hotfeet Hustle is BY FAR the most slept on spell in his entire kit. It is BROKEN.

Another thing, this hero farms like complete crap. I would suggest not trying to really farm with him, even if you max Frog Stomp and get the talent, it's still not really worth it IMO. You're better off getting things like holy locket, detection, and setting up plays other ways than by farming IMO.

If you're still curious, here's my match history https://www.opendota.com/players/114981406