Frog Grog Slot RTP and Review (Thunderkick)

A madcap 5 reel, 23 payline slot set in a cavernous laboratory which uses dropping reels, re-spins, multipliers and mystery games. This slot has a 96.1% RTP, medium to high variance and features a burping frog that turns blue and wild! Top payout is 1,616x your bet.

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Slot Game Profile
Release Date: 2016
Studio: Thunderkick
Game Type: Video Slot
RTP: 96.1%
Variance: High
Reels: 5
Paylines: 23
Stake Range: 10p to £100
Game Features: Dropping Symbols, Wild Burping Frog!, Multipliers, Mystery Game


Wild Burping Frog!
Wild Burping Frog!

Once again Thunderkick have delivered a slot game that looks, feels and sound superb. The graphics are sharp – the lab looks like something from a witches dungeon, with spiders crawling across the reels and a blue frog dropping in from time to time.

Just like some other excellent titles from Thunderkick, Frog Grog uses the dropping reels mechanic to make this game flow nicely – winning spins are always followed by re-spins where new symbols replace the winning ones, and the multiplier increases by up to 7x.

There is also a Mystery Game feature here which can randomly trigger and deliver spins with only the high value symbols on the reels and where the multiplier is in effect as well.

Like all Thunderkick games, this one can be enjoyed from 10p up to £100 per spin, and is available at Thunderkick Casinos for free and real play. Start playing now or read on for our full game review.




The backdrop for Frog Grog is what looks like a witch’s or wizard’s laboratory. The reels are set up 5×3 on a row of shelves. Around the side are candles, spell books, a cauldron, bottles of potions, keys, birdcages, and other paraphernalia. To the left of the reels is the multiplier indicator, in pink neon.

The slick artwork here is complemented by smooth animations on mobile and desktop versions. The symbols themselves are a range of potion bottles, specimen jars and other items. There are six in total, with the blue potion the lowest paying at 2x for five in a row. The blue butterfly in a jar is the highest paying at 10x for five in a row.

Look out as well for the Wild frog symbol which substitutes for all others. When it lands it sticks around for the rest of the game round and can help deliver some big wins.


Frog Grog Flower
Frog Grog Flower

It’s fun just to sit back and watch any Thunderkick game, and it gets even better when you trigger any of these features:

Dropping Reels – This is the standard base game feature whereby any winning spin is followed by a re-spin. Firstly though, all winning symbols drop off the reels and are replaced with new ones and the multiplier indicator to the left of the screen increases one place. Consecutive wins push the multiplier up as high as 7x.

Wild Burping Frog – Not something you see that often! But this is the world of Thunderkick so here we go. If the Wild frog symbol becomes part of a winning line then the Frog Burp feature comes up. All other symbols on the same frog row and reel are removed and the frog turns blue. He remains in that position for the rest of the game round. This has potential to push some nice wins your way.

Mystery Game Feature – This one turns up randomly in the game when you get a dry spin. It gives you a better chance of landing some bigger wins by removing lower value symbols from the reels. All that remains is the Wild Frog and the two highest paying symbols of the Butterfly and Flower. For consecutive wins you are also eligible for the multiplier at this point, so again there is potential to strike some nice payouts here.


For a game that lacks any bonus round or free spins Frog Grog is surprisingly entertaining. This slot ticks along nicely, and the dropping symbols feature makes for some interesting wins. The top payout here is 1,616x, available if you can hit the 7x multiplier, and most likely with the Wild Frog working his magic. Just remember the variance is on the high side so watch your bankroll and go easy on the stakes if you want to make it last!

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